Finding the Fourth Proportional to 31,260.72, 43,131.24 and 20,089.20

Step by Step Solution

1. Step 1: Write the proportion equation
   31,260.72 : 43,131.24 = 20,089.20 : x
2. Step 2: Convert to fraction form
   31,260.72/43,131.24 = 20,089.20/x
3. Step 3: Cross multiply
   31,260.72x = 43,131.24 × 20,089.20
4. Step 4: Simplify right side
   31,260.72x = 866,472,106.61
5. Step 5: Solve for x
   x = 866,472,106.61/31,260.72
6. Step 6: Final answer
   x = 27,717.60