Finding the Fourth Proportional to 22,560.55, 31,133.18 and 12,488.78

Step by Step Solution

1. Step 1: Write the proportion equation
   22,560.55 : 31,133.18 = 12,488.78 : x
2. Step 2: Convert to fraction form
   22,560.55/31,133.18 = 12,488.78/x
3. Step 3: Cross multiply
   22,560.55x = 31,133.18 × 12,488.78
4. Step 4: Simplify right side
   22,560.55x = 388,815,311.28
5. Step 5: Solve for x
   x = 388,815,311.28/22,560.55
6. Step 6: Final answer
   x = 17,234.30