Finding the Fourth Proportional to 787.59, 1,086.98 and 522.09

Step by Step Solution

1. Step 1: Write the proportion equation
   787.59 : 1,086.98 = 522.09 : x
2. Step 2: Convert to fraction form
   787.59/1,086.98 = 522.09/x
3. Step 3: Cross multiply
   787.59x = 1,086.98 × 522.09
4. Step 4: Simplify right side
   787.59x = 567,498.78
5. Step 5: Solve for x
   x = 567,498.78/787.59
6. Step 6: Final answer
   x = 720.55