You can use similar triangles to find the height of the tree. The ratio of corresponding sides in similar triangles is equal. Let \( h_s \) be the height of the stop sign, \( s_s \) be the length of the stop sign's shadow, \( h_t \) be the height of the tree, and \( s_t \) be the length of the tree's shadow.
The ratio is given by:
\[ \frac{h_s}{s_s} = \frac{h_t}{s_t} \]
Substitute the given values:
\[ \frac{7}{4} = \frac{h_t}{36} \]
Now, solve for \( h_t \):
\[ h_t = \frac{7}{4} \times 36 \]