In △XYZ\triangle XYZ△XYZ, x=9x=9x=9, y=12y=12y=12, and ∠Z=60∘\angle Z = 60^\circ∠Z=60∘. Find the length of side zzz.
117\sqrt{117}117
144\sqrt{144}144
129\sqrt{129}129
108\sqrt{108}108