Li Jun was supposed to pay Molly $$5,000,6$ months ago, and $$1,200,5$ months from now. If she wants to reschedule these payments with two payments, one payment of $$3,400$ today and the balance $3$ months from now, calculate the balance amount. Assume that the simple interest charged is $4\mathrm{.}25\%$ p$.$a$.$ and the agreed focal date is $3$ months from now.