Finding the Fourth Proportional to 81,850.17, 122,769.72 and 31,920.96

Step by Step Solution

1. Step 1: Write the proportion equation
   81,850.17 : 122,769.72 = 31,920.96 : x
2. Step 2: Convert to fraction form
   81,850.17/122,769.72 = 31,920.96/x
3. Step 3: Cross multiply
   81,850.17x = 122,769.72 × 31,920.96
4. Step 4: Simplify right side
   81,850.17x = 3,918,927,321.33
5. Step 5: Solve for x
   x = 3,918,927,321.33/81,850.17
6. Step 6: Final answer
   x = 47,879.28