how do you multiply numbers which have powers in the decimals?

Usually, unless it is something simple like 0.5 (which is the square root)  as the exponent, you will have to use a calculator (or slide rule..LOL)

 

14^(.214) = 14^.214 = 1.7590225202381281     use the  \({x}^{y}\)   key on the calculator...

Example: \(32^{0.6} = (\sqrt[5]{32})^3 = 8\)

You usually change it into fraction and calculate using Law of Indices.