Your friend is expected to make loan payments of $$641$ due $85$ days ago and $$719$ due today are to be repaid by a payment of $$584,40$ days from today and the balance in $140$ days. If money is worth $8\mathrm{.}5\%$ and the agreed focal is $140$ from today, what is the size of the final payment?

$*$Hint: draw a timeline first to help with your solution

Your answer must be rounded to the correct number of decimal places and include the unit