Finding the Fourth Proportional to 22,672.20, 31,287.15 and 13,113.39

Step by Step Solution

1. Step 1: Write the proportion equation
   22,672.20 : 31,287.15 = 13,113.39 : x
2. Step 2: Convert to fraction form
   22,672.20/31,287.15 = 13,113.39/x
3. Step 3: Cross multiply
   22,672.20x = 31,287.15 × 13,113.39
4. Step 4: Simplify right side
   22,672.20x = 410,280,599.94
5. Step 5: Solve for x
   x = 410,280,599.94/22,672.20
6. Step 6: Final answer
   x = 18,096.20