Using the data below, what is the simple exponential smoothing forecast for the $4$ th week where $=0\mathrm{.}4?$

$\backslash$table$[[$Week$,$Time Series Value$],[1,6\mathrm{.}00],[2,4\mathrm{.}00],[3,8\mathrm{.}00],[4,7\mathrm{.}00]]$

Answer format: Number: Round to: $1$ decimal places.