Answer
$\approx554.5\text{ ft}.$
Work Step by Step
We know that $\tan{\theta}=\frac{\text{opposite}}{\text{adjacent}}$.
We can denote that $\tan{(35.1^o)}=\frac{d}{789}$, hence $d=789\tan{(35.1^o)}\approx554.5\text{ ft}.$
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