A periodic decimal 0.x‾0.\overline{x}0.x is defined as x9\frac{x}{9}9x. If x9=715\frac{x}{9} = \frac{7}{15}9x=157, what is the value of xxx?
4.24.24.2
4.54.54.5
4.84.84.8
5.05.05.0