Finding the Fourth Proportional to 1,087.59, 1,501.02 and 667.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.59 : 1,501.02 = 667.86 : x
2. Step 2: Convert to fraction form
   1,087.59/1,501.02 = 667.86/x
3. Step 3: Cross multiply
   1,087.59x = 1,501.02 × 667.86
4. Step 4: Simplify right side
   1,087.59x = 1,002,471.22
5. Step 5: Solve for x
   x = 1,002,471.22/1,087.59
6. Step 6: Final answer
   x = 921.74