Finding the Fourth Proportional to 22,665.72, 31,281.22 and 13,713.60

Step by Step Solution

1. Step 1: Write the proportion equation
   22,665.72 : 31,281.22 = 13,713.60 : x
2. Step 2: Convert to fraction form
   22,665.72/31,281.22 = 13,713.60/x
3. Step 3: Cross multiply
   22,665.72x = 31,281.22 × 13,713.60
4. Step 4: Simplify right side
   22,665.72x = 428,978,138.59
5. Step 5: Solve for x
   x = 428,978,138.59/22,665.72
6. Step 6: Final answer
   x = 18,926.30