Scheduled payments of $$1200$ due one year ago and $$1000$ due six months ago are to be replaced by a payment of $$800$ now, a second payment of $$1000$ nine months from now, and a final payment $18$ months from now. What is the size of the final payment if interest is $10\mathrm{.}8\%$ compounded quarterly?

COMPOUND INTEREST FUTURE VALUE AND PRESENT VALUE MATH