Answer
$74.31^{\circ}$
Work Step by Step
1. Use convertion
$1'=\frac{1}{60}^{\circ}$
$1''=\frac{1}{3600}^{\circ}$
2. $74^{\circ}18'36"=74^{\circ}+\frac{18}{60}^{\circ}+\frac{36}{3600}^{\circ}=74.31^{\circ}$
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