Finding the Fourth Proportional to 1,087.30, 1,499.92 and 688.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.30 : 1,499.92 = 688.29 : x
2. Step 2: Convert to fraction form
   1,087.30/1,499.92 = 688.29/x
3. Step 3: Cross multiply
   1,087.30x = 1,499.92 × 688.29
4. Step 4: Simplify right side
   1,087.30x = 1,032,369.00
5. Step 5: Solve for x
   x = 1,032,369.00/1,087.30
6. Step 6: Final answer
   x = 949.48