Finding the Fourth Proportional to 31,024.20, 42,799.55 and 20,949.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,024.20 : 42,799.55 = 20,949.42 : x
2. Step 2: Convert to fraction form
   31,024.20/42,799.55 = 20,949.42/x
3. Step 3: Cross multiply
   31,024.20x = 42,799.55 × 20,949.42
4. Step 4: Simplify right side
   31,024.20x = 896,625,644.01
5. Step 5: Solve for x
   x = 896,625,644.01/31,024.20
6. Step 6: Final answer
   x = 28,900.85