plz solve this question and explain it, thx

Scheduled payments of $800 due two months ago and $1200 due in one month are to be repaid by a payment of $1000 today and the balance in three months What is the amount of the final payment if interest is 7.75% and the focal date is one month from now? The amount of the payment is $ .(Round the final answer to the nearest cent as needed Round all intermediate values to six decimal places as needed.)