Finding the Fourth Proportional to 81,796.42, 122,694.42 and 25,640.80

Step by Step Solution

1. Step 1: Write the proportion equation
   81,796.42 : 122,694.42 = 25,640.80 : x
2. Step 2: Convert to fraction form
   81,796.42/122,694.42 = 25,640.80/x
3. Step 3: Cross multiply
   81,796.42x = 122,694.42 × 25,640.80
4. Step 4: Simplify right side
   81,796.42x = 3,145,983,084.34
5. Step 5: Solve for x
   x = 3,145,983,084.34/81,796.42
6. Step 6: Final answer
   x = 38,461.13