$62x:56y:60z$ $=$ $13:15:72$
⇒$\frac{62x}{13}$ =$\frac{56y}{15}$= $\frac{60z}{72}$
⇒$\frac{62x}{13}$.$\frac{1}{26040}$ =$\frac{56y}{15}$.$\frac{1}{26040}$= $\frac{60z}{72}$ .$\frac{1}{26040}$
⇒$\frac{x}{5460}$ =$\frac{y}{6975}$ =$\frac{z}{31248}$
⇒$\frac{x}{1820}$ =$\frac{y}{2325}$ =$\frac{z}{10416}$