Answer:
492
Step-by-step explanation:
The triangle formed by the upper vertex and AB is similar to the triangle formed by the upper vertex and the lower vertices; therefore,
Note that in the above 1092 is the Miami-Bermuda distance, 984 is san Juan - Bermuda distance, and 546 is 1092/2 or Miami - B distance.
Cross multipication gives
Dividing both sides by 1092 gives
which is our answer!