Payments of $$3,150$ due $18$ months ago and $$3,950$ due in three years are to be replaced by an equivalent stream of payments consisting of $$2,850$ today and two equal payments due two and four years from now. If money can earn $9\mathrm{.}75\%$ compounded semiannually, what should be the amount of each of these two payments? $($Do not round intermediate calculations and round your final answer to $2$ decimal places.$)$

Each payment $