For each of the following, compute the present value:

Note: Do not round intermediate calculations and round your answers to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

$\backslash$table$[[$Present Value,Years,Interest Rate,,Future Value$],[,12,,\%,18,928],[,4,9,\%,43,117],[,16,12,\%,806,382],[,21,11,\%,663,816]]$