Finding the Fourth Proportional to 31,162.62, 42,982.60 and 21,086.63

Step by Step Solution

1. Step 1: Write the proportion equation
   31,162.62 : 42,982.60 = 21,086.63 : x
2. Step 2: Convert to fraction form
   31,162.62/42,982.60 = 21,086.63/x
3. Step 3: Cross multiply
   31,162.62x = 42,982.60 × 21,086.63
4. Step 4: Simplify right side
   31,162.62x = 906,358,115.73
5. Step 5: Solve for x
   x = 906,358,115.73/31,162.62
6. Step 6: Final answer
   x = 29,084.78