Finding the Fourth Proportional to 331,085.16, 496,621.98 and 81,767.40

Step by Step Solution

1. Step 1: Write the proportion equation
   331,085.16 : 496,621.98 = 81,767.40 : x
2. Step 2: Convert to fraction form
   331,085.16/496,621.98 = 81,767.40/x
3. Step 3: Cross multiply
   331,085.16x = 496,621.98 × 81,767.40
4. Step 4: Simplify right side
   331,085.16x = 40,607,488,087.45
5. Step 5: Solve for x
   x = 40,607,488,087.45/331,085.16
6. Step 6: Final answer
   x = 122,649.68