Let's define the lengths of the trails using the following variables:
- Let \( B \) be the length of the Beginners Trail.
- The Medium Trail, being 1.2 times as long as the Beginners Trail, can be represented as \( M = 1.2B \).
- The Advanced Trail, being 3.6 times as long as the Medium Trail, can be represented as \( A = 3.6M \).
Now, substituting for \( M \):
\[ A = 3.6(1.2B) \]
Calculating \( A \):
\[ A = 3.6 \times 1.2B = 4.32B \]
Therefore, the Advanced Trail is 4.32 times as long as the Beginners Trail.
Final answer: The Advanced Trail is 4.32 times as long as the Beginners Trail.