Finding the Fourth Proportional to 81,788.98, 122,610.68 and 31,857.42

Step by Step Solution

1. Step 1: Write the proportion equation
   81,788.98 : 122,610.68 = 31,857.42 : x
2. Step 2: Convert to fraction form
   81,788.98/122,610.68 = 31,857.42/x
3. Step 3: Cross multiply
   81,788.98x = 122,610.68 × 31,857.42
4. Step 4: Simplify right side
   81,788.98x = 3,906,059,929.25
5. Step 5: Solve for x
   x = 3,906,059,929.25/81,788.98
6. Step 6: Final answer
   x = 47,757.78