Finding the Fourth Proportional to 31,707.31, 43,785.15 and 20,403.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,707.31 : 43,785.15 = 20,403.25 : x
2. Step 2: Convert to fraction form
   31,707.31/43,785.15 = 20,403.25/x
3. Step 3: Cross multiply
   31,707.31x = 43,785.15 × 20,403.25
4. Step 4: Simplify right side
   31,707.31x = 893,359,361.74
5. Step 5: Solve for x
   x = 893,359,361.74/31,707.31
6. Step 6: Final answer
   x = 28,175.19