Finding the Fourth Proportional to 1,391.52, 2,086.56 and 525.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.52 : 2,086.56 = 525.24 : x
2. Step 2: Convert to fraction form
   1,391.52/2,086.56 = 525.24/x
3. Step 3: Cross multiply
   1,391.52x = 2,086.56 × 525.24
4. Step 4: Simplify right side
   1,391.52x = 1,095,944.77
5. Step 5: Solve for x
   x = 1,095,944.77/1,391.52
6. Step 6: Final answer
   x = 787.59