Finding the Fourth Proportional to 1,087.24, 1,499.83 and 688.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.24 : 1,499.83 = 688.23 : x
2. Step 2: Convert to fraction form
   1,087.24/1,499.83 = 688.23/x
3. Step 3: Cross multiply
   1,087.24x = 1,499.83 × 688.23
4. Step 4: Simplify right side
   1,087.24x = 1,032,220.50
5. Step 5: Solve for x
   x = 1,032,220.50/1,087.24
6. Step 6: Final answer
   x = 949.40