Finding the Fourth Proportional to 1,087.74, 1,500.52 and 688.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.74 : 1,500.52 = 688.72 : x
2. Step 2: Convert to fraction form
   1,087.74/1,500.52 = 688.72/x
3. Step 3: Cross multiply
   1,087.74x = 1,500.52 × 688.72
4. Step 4: Simplify right side
   1,087.74x = 1,033,438.13
5. Step 5: Solve for x
   x = 1,033,438.13/1,087.74
6. Step 6: Final answer
   x = 950.08