A person owes $2150 at the end of 4 years and $6450 at the end of 9 years. Due to changes in their financial situation, the person was allowed to pay $1750 at the end of 2 year(s) and a final payment at the end of 12 years using 10.5% compounded annually for the settlement. Determine the amount required to settle the debt at the end of 12 years.