Finding the Fourth Proportional to 57,049.22, 78,728.39 and 31,557.31

Step by Step Solution

1. Step 1: Write the proportion equation
   57,049.22 : 78,728.39 = 31,557.31 : x
2. Step 2: Convert to fraction form
   57,049.22/78,728.39 = 31,557.31/x
3. Step 3: Cross multiply
   57,049.22x = 78,728.39 × 31,557.31
4. Step 4: Simplify right side
   57,049.22x = 2,484,456,209.03
5. Step 5: Solve for x
   x = 2,484,456,209.03/57,049.22
6. Step 6: Final answer
   x = 43,549.35