Finding the Fourth Proportional to 22,560.17, 31,132.67 and 12,488.40

Step by Step Solution

1. Step 1: Write the proportion equation
   22,560.17 : 31,132.67 = 12,488.40 : x
2. Step 2: Convert to fraction form
   22,560.17/31,132.67 = 12,488.40/x
3. Step 3: Cross multiply
   22,560.17x = 31,132.67 × 12,488.40
4. Step 4: Simplify right side
   22,560.17x = 388,797,173.59
5. Step 5: Solve for x
   x = 388,797,173.59/22,560.17
6. Step 6: Final answer
   x = 17,233.79