Finding the Fourth Proportional to 1,087.53, 1,500.15 and 668.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.53 : 1,500.15 = 668.07 : x
2. Step 2: Convert to fraction form
   1,087.53/1,500.15 = 668.07/x
3. Step 3: Cross multiply
   1,087.53x = 1,500.15 × 668.07
4. Step 4: Simplify right side
   1,087.53x = 1,002,205.21
5. Step 5: Solve for x
   x = 1,002,205.21/1,087.53
6. Step 6: Final answer
   x = 921.54