Finding the Fourth Proportional to 31,589.33, 43,640.82 and 20,713.30

Step by Step Solution

1. Step 1: Write the proportion equation
   31,589.33 : 43,640.82 = 20,713.30 : x
2. Step 2: Convert to fraction form
   31,589.33/43,640.82 = 20,713.30/x
3. Step 3: Cross multiply
   31,589.33x = 43,640.82 × 20,713.30
4. Step 4: Simplify right side
   31,589.33x = 903,945,287.80
5. Step 5: Solve for x
   x = 903,945,287.80/31,589.33
6. Step 6: Final answer
   x = 28,615.53