Solve for the unknown number of years in each of the following:

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

Present Value Years Interest Rate Future Value

$$6107\%$ $$1,389$

$$9408\%$ $$1,821$

$$26,3509\%$ $$289,715$

$$43,50011\%$ $$430,258$