Drake has a checking account at a major bank. During the month of April, he made deposits totaling $$1,389\mathrm{.}74,$ wrote checks that totaled $$515\mathrm{.}93,$ paid a maintenance fee of $$10,$ and earned $$4\mathrm{.}15$ in interest. At the end of April, his balance was $$3,312\mathrm{.}45.$ What was his balance at the beginning of the month?