Answer
$59$
Work Step by Step
We can see that the difference of subsequent terms is $5$, thus $d=5$.
The nth term of a geometric sequence can be obtained by the following formula: $a_n=a_1+(n-1)d$, where $a_1$ is the first term and $d$ is the common difference.
Hence here: $a_{12}=4+5(12-1)=4+55=59$
