Finding the Fourth Proportional to 1,087.72, 1,501.17 and 668.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.72 : 1,501.17 = 668.08 : x
2. Step 2: Convert to fraction form
   1,087.72/1,501.17 = 668.08/x
3. Step 3: Cross multiply
   1,087.72x = 1,501.17 × 668.08
4. Step 4: Simplify right side
   1,087.72x = 1,002,901.65
5. Step 5: Solve for x
   x = 1,002,901.65/1,087.72
6. Step 6: Final answer
   x = 922.02