Let's denote the length of the beginner trail as \( B \).
According to the information provided:
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The medium trail is 1.2 times as long as the beginner trail: \[ M = 1.2B \]
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The advanced trail is 3.6 times as long as the medium trail: \[ A = 3.6M \]
Substituting the expression for \( M \) into the equation for \( A \): \[ A = 3.6(1.2B) \]
Now, calculate \( 3.6 \times 1.2 \): \[ 3.6 \times 1.2 = 4.32 \]
So, we have: \[ A = 4.32B \]
This means the advanced trail is 4.32 times as long as the beginner trail.
Thus, the answer is: \[ \boxed{4.32} \]