Question 1134162
P=Po[(1+(r/n))]^72 -1 divided by (r/n).  The 72 is 4 quarterly deposits for 18 years.
As an aside, $500 deposited quarterly would give $36,000 in 18 years, so the answer will be significantly less than that.

37000=Po(1+(.09/4))^72-1/(0.09/4)
=Po*3.963/0.0225, but round only at the end.
=Po*$176.14
37000/176.14=$210.06, rounding here.

This is reasonable.