Verified answer

[tex] \frac{log64}{log4} = logx \\ \\ \frac{log {4}^{3} }{log4} = logx \\ \\ \frac{3log4}{log4} = logx \\ \\ logx = 3[/tex]

we know

[tex]if \: \: \: loga = b \: \: we \: \: have \: \: a = {10}^{b} [/tex]

hence

[tex]x = {10}^{3} \\ \\ x = 1000[/tex]

its just a try if i am wrong realy very very very sorry forgive me