Finding the Fourth Proportional to 31,401.59, 43,309.12 and 20,657.49

Step by Step Solution

1. Step 1: Write the proportion equation
   31,401.59 : 43,309.12 = 20,657.49 : x
2. Step 2: Convert to fraction form
   31,401.59/43,309.12 = 20,657.49/x
3. Step 3: Cross multiply
   31,401.59x = 43,309.12 × 20,657.49
4. Step 4: Simplify right side
   31,401.59x = 894,657,713.31
5. Step 5: Solve for x
   x = 894,657,713.31/31,401.59
6. Step 6: Final answer
   x = 28,490.84