Finding the Fourth Proportional to 22,499.52, 31,049.20 and 12,428.60

Step by Step Solution

1. Step 1: Write the proportion equation
   22,499.52 : 31,049.20 = 12,428.60 : x
2. Step 2: Convert to fraction form
   22,499.52/31,049.20 = 12,428.60/x
3. Step 3: Cross multiply
   22,499.52x = 31,049.20 × 12,428.60
4. Step 4: Simplify right side
   22,499.52x = 385,898,087.12
5. Step 5: Solve for x
   x = 385,898,087.12/22,499.52
6. Step 6: Final answer
   x = 17,151.39