Oracle 11g Release 2

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CREATE TABLE tablename (Report_Month timestamp, PCT_Change float, Initial_Value float);
INSERT ALL 
    INTO tablename (Report_Month, PCT_Change, Initial_Value)
         VALUES ('01-Aug-2021 12:00:00 AM', 0.1202, 0.88)
    INTO tablename (Report_Month, PCT_Change, Initial_Value)
         VALUES ('01-Sep-2021 12:00:00 AM', -.0426, NULL)
    INTO tablename (Report_Month, PCT_Change, Initial_Value)
         VALUES ('01-Oct-2021 12:00:00 AM', -0.0794, NULL)
    INTO tablename (Report_Month, PCT_Change, Initial_Value)
         VALUES ('01-Nov-2021 12:00:00 AM', 0.0726, NULL)
    INTO tablename (Report_Month, PCT_Change, Initial_Value)
         VALUES ('01-Dec-2021 12:00:00 AM', 0.1182, NULL)
SELECT * FROM dual;
5 rows affected

SELECT * FROM tablename;


REPORT_MONTH
PCT_CHANGE
INITIAL_VALUE


01-AUG-21 12.00.00.000000 AM
.1202
.88

01-SEP-21 12.00.00.000000 AM
-.0426
null

01-OCT-21 12.00.00.000000 AM
-.0794
null

01-NOV-21 12.00.00.000000 AM
.0726
null

01-DEC-21 12.00.00.000000 AM
.1182
null


SELECT t.Report_Month, t.pct_change,
       ROUND(0.88 * EXP(SUM(LN((1 + pct_change))) OVER (ORDER BY report_month)), 10) Value
FROM tablename t


REPORT_MONTH
PCT_CHANGE
VALUE


01-AUG-21 12.00.00.000000 AM
.1202
.985776

01-SEP-21 12.00.00.000000 AM
-.0426
.9437819424

01-OCT-21 12.00.00.000000 AM
-.0794
.8688456562

01-NOV-21 12.00.00.000000 AM
.0726
.9319238508

01-DEC-21 12.00.00.000000 AM
.1182
1.04207725

REPORT_MONTH	PCT_CHANGE	INITIAL_VALUE
01-AUG-21 12.00.00.000000 AM	.1202	.88
01-SEP-21 12.00.00.000000 AM	-.0426	null
01-OCT-21 12.00.00.000000 AM	-.0794	null
01-NOV-21 12.00.00.000000 AM	.0726	null
01-DEC-21 12.00.00.000000 AM	.1182	null

REPORT_MONTH	PCT_CHANGE	VALUE
01-AUG-21 12.00.00.000000 AM	.1202	.985776
01-SEP-21 12.00.00.000000 AM	-.0426	.9437819424
01-OCT-21 12.00.00.000000 AM	-.0794	.8688456562
01-NOV-21 12.00.00.000000 AM	.0726	.9319238508
01-DEC-21 12.00.00.000000 AM	.1182	1.04207725