Aidan wants to pay off the loan on his refrigerated trailer on which he has made $15$ payments. If Aidan's monthly payment is $$397\mathrm{.}79$ on a $3-$year loan at an annual percentage rate of $5\mathrm{.}5\%,$ what is the payoff amount $($in dollars$)?($Round your answer to the nearest cent. See Example $10$ in this section.$)$