Reference nth row from another sheet

[dta1984]

In cell T34 of my first sheet, i want to reference cell AG84 from a second sheet, and from there copy the formula down on the first sheet so the results would display reesults from AG88, AG92 ...every 4th cell from the second sheet.

I have tried the following index formula, and have had no luck;

=INDEX('Savings Sheet'!$AG:$AG,4*(ROWS('Savings Sheet'!AG84)-1)+1)

I searched and that's where I came up with the index formula. I'm sure I just have it set up wrong though.

[martindwilson]

=INDEX('savings sheet'!$AG$84:$AG$2000,ROWS($A$1:A1)*4-3)
or
=INDEX('savings sheet'!$AG:$AG,83+ROWS($A$1:A1)*4-3)

[dta1984]

=INDEX('savings sheet'!$AG$84:$AG$2000,ROWS($A$1:A1)*4-3)
or
=INDEX('savings sheet'!$AG:$AG,83+ROWS($A$1:A1)*4-3)

Those return my first value from (AG84), but when i copy it down, I just get 0s. From here, I need AG88, AG92 etc. Can you explain the "ROWS($A$1:A1) part of the formula?

[martindwilson]

works for me see sheet 1
ROWS($A$1:A1)=1
ROWS($A$1:A2)=2
ROWS($A$1:A3)=3
and so on as it's dragged down

[dta1984]

works for me see sheet 1
ROWS($A$1:A1)=1
ROWS($A$1:A2)=2
ROWS($A$1:A3)=3
and so on as it's dragged down

Yours definitely works perfectly. Even copied exactly I get nothing. Can my rows can be any or do they have to be A.... The sheet is filled with data

Edit; I got it, Thanks!!!