Finding the Fourth Proportional to 22,559.46, 31,132.02 and 13,128

Step by Step Solution

1. Step 1: Write the proportion equation
   22,559.46 : 31,132.02 = 13,128 : x
2. Step 2: Convert to fraction form
   22,559.46/31,132.02 = 13,128/x
3. Step 3: Cross multiply
   22,559.46x = 31,132.02 × 13,128
4. Step 4: Simplify right side
   22,559.46x = 408,701,158.56
5. Step 5: Solve for x
   x = 408,701,158.56/22,559.46
6. Step 6: Final answer
   x = 18,116.62