Finding the Fourth Proportional to 1,025.13, 1,529.82 and 915.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,025.13 : 1,529.82 = 915.78 : x
2. Step 2: Convert to fraction form
   1,025.13/1,529.82 = 915.78/x
3. Step 3: Cross multiply
   1,025.13x = 1,529.82 × 915.78
4. Step 4: Simplify right side
   1,025.13x = 1,400,978.56
5. Step 5: Solve for x
   x = 1,400,978.56/1,025.13
6. Step 6: Final answer
   x = 1,366.64