Finding the Fourth Proportional to 81,436.78, 122,116.56 and 31,540.24

Step by Step Solution

1. Step 1: Write the proportion equation
   81,436.78 : 122,116.56 = 31,540.24 : x
2. Step 2: Convert to fraction form
   81,436.78/122,116.56 = 31,540.24/x
3. Step 3: Cross multiply
   81,436.78x = 122,116.56 × 31,540.24
4. Step 4: Simplify right side
   81,436.78x = 3,851,585,610.37
5. Step 5: Solve for x
   x = 3,851,585,610.37/81,436.78
6. Step 6: Final answer
   x = 47,295.41