$\"\"$

From the diagram adjecent side 23.7 the missing legth is adjecent to the angle measuring $\"\"$ and opposite side is x.

The trigonometric function relating adjecent side of a triangle and then adjecent side is tangent function.

$\"\"$

$\"\"$ (Substitute $\"\"$ )

$\"\"$

Apply cross product property $\"\"$ then ad = bc.

$\"\"$ \ \

$\"\"$

The value is $\"\"$ .