Finding the Fourth Proportional to 1,087.42, 1,500.77 and 667.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.42 : 1,500.77 = 667.83 : x
2. Step 2: Convert to fraction form
   1,087.42/1,500.77 = 667.83/x
3. Step 3: Cross multiply
   1,087.42x = 1,500.77 × 667.83
4. Step 4: Simplify right side
   1,087.42x = 1,002,260.90
5. Step 5: Solve for x
   x = 1,002,260.90/1,087.42
6. Step 6: Final answer
   x = 921.69