Finding the Fourth Proportional to 22,959.56, 31,658.10 and 20,720.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,959.56 : 31,658.10 = 20,720.72 : x
2. Step 2: Convert to fraction form
   22,959.56/31,658.10 = 20,720.72/x
3. Step 3: Cross multiply
   22,959.56x = 31,658.10 × 20,720.72
4. Step 4: Simplify right side
   22,959.56x = 655,978,625.83
5. Step 5: Solve for x
   x = 655,978,625.83/22,959.56
6. Step 6: Final answer
   x = 28,571.05