Finding the Fourth Proportional to 31,162.31, 42,982.17 and 21,086.32

Step by Step Solution

1. Step 1: Write the proportion equation
   31,162.31 : 42,982.17 = 21,086.32 : x
2. Step 2: Convert to fraction form
   31,162.31/42,982.17 = 21,086.32/x
3. Step 3: Cross multiply
   31,162.31x = 42,982.17 × 21,086.32
4. Step 4: Simplify right side
   31,162.31x = 906,335,630.74
5. Step 5: Solve for x
   x = 906,335,630.74/31,162.31
6. Step 6: Final answer
   x = 29,084.35