Find the projection of the vector $ \hat i + 3\hat j + 7\hat k$ on the vector $7\hat i − \hat j + 8\hat k$.

Question

$\begin{array}{1 1} \frac{60 }{\sqrt{59}} \\ \frac{60 }{\sqrt{114}} \\ \frac{66 }{\sqrt{59}} \\ \frac{66 }{\sqrt{114}} \end{array} $