Finding the Fourth Proportional to 31,132.60, 42,949.99 and 20,380.10

Step by Step Solution

1. Step 1: Write the proportion equation
   31,132.60 : 42,949.99 = 20,380.10 : x
2. Step 2: Convert to fraction form
   31,132.60/42,949.99 = 20,380.10/x
3. Step 3: Cross multiply
   31,132.60x = 42,949.99 × 20,380.10
4. Step 4: Simplify right side
   31,132.60x = 875,325,147.62
5. Step 5: Solve for x
   x = 875,325,147.62/31,132.60
6. Step 6: Final answer
   x = 28,116.03