Answer
$\frac{1}{12}$.
Work Step by Step
$n(S)=3\cdot4\cdot2=24$, because the second spinner can have $3$ outcomes, the first spinner can have $4$ outcomes and the third spinner can have $2$ outcomes.
$n(E)=2$, because either a yellow followed by a $2$ and a forward or a yellow followed by a $4$ and a forward are the required outcomes.
We know that $P(E)=\frac{n(E)}{n(S)}$, hence $P=\frac{2}{24}=\frac{1}{12}$.