#### Answer

$S_{y}= 16$

#### Work Step by Step

The values in the sequence are getting smaller and smaller in a geometric sequence. When we divide consecutive terms, we see we have a common ratio of 3/4.
We can use the formula $S_{y}=a/(1-r)$, where a is the first term and r is the ratio between terms.
Thus:
$S_{y}=4/(1-3/4)=4/(1/4)=16$