Finding the Fourth Proportional to 49,449.20, 68,221.50 and 31,540.10

Step by Step Solution

1. Step 1: Write the proportion equation
   49,449.20 : 68,221.50 = 31,540.10 : x
2. Step 2: Convert to fraction form
   49,449.20/68,221.50 = 31,540.10/x
3. Step 3: Cross multiply
   49,449.20x = 68,221.50 × 31,540.10
4. Step 4: Simplify right side
   49,449.20x = 2,151,712,932.15
5. Step 5: Solve for x
   x = 2,151,712,932.15/49,449.20
6. Step 6: Final answer
   x = 43,513.60