Finding the Fourth Proportional to 1,088.34, 1,500.42 and 689.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,088.34 : 1,500.42 = 689.80 : x
2. Step 2: Convert to fraction form
   1,088.34/1,500.42 = 689.80/x
3. Step 3: Cross multiply
   1,088.34x = 1,500.42 × 689.80
4. Step 4: Simplify right side
   1,088.34x = 1,034,989.72
5. Step 5: Solve for x
   x = 1,034,989.72/1,088.34
6. Step 6: Final answer
   x = 950.98