Finding the Fourth Proportional to 1,131.24, 1,562.52 and 872.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.24 : 1,562.52 = 872.40 : x
2. Step 2: Convert to fraction form
   1,131.24/1,562.52 = 872.40/x
3. Step 3: Cross multiply
   1,131.24x = 1,562.52 × 872.40
4. Step 4: Simplify right side
   1,131.24x = 1,363,142.45
5. Step 5: Solve for x
   x = 1,363,142.45/1,131.24
6. Step 6: Final answer
   x = 1,205.00