Observations of a star in a nearby galaxy show that it is about $6\mathrm{.}4$times $104$ light$-$years from the center and that the galaxy has a mass of $8\mathrm{.}2$ x $1011$ solar masses. What is the orbital period of the star in years?

Express your answer in scientific notation using three significant figures $($e$.$g$.13680\mathrm{.}3$ would be expressed as $1\mathrm{.}37*10^4).$