Finding the Fourth Proportional to 1,102.59, 1,521.17 and 787.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,102.59 : 1,521.17 = 787.89 : x
2. Step 2: Convert to fraction form
   1,102.59/1,521.17 = 787.89/x
3. Step 3: Cross multiply
   1,102.59x = 1,521.17 × 787.89
4. Step 4: Simplify right side
   1,102.59x = 1,198,510.69
5. Step 5: Solve for x
   x = 1,198,510.69/1,102.59
6. Step 6: Final answer
   x = 1,087.00