What is the Simple Exponential Smoothing $($SES$)$ forecast with an alpha of $.6$ for period $4$ is: $($round to $2$ decimal places$)$

$\backslash$table$[[$Week or$,$Time series value or$,],[$X$($Period$),Y($Sales$),$Forecast$],[1,4,13],[2,12,],[3,10,],[4,15,],[5,12,]]$