Finding the Fourth Proportional to 259,111.22, 388,680.78 and 81,632.12

Step by Step Solution

1. Step 1: Write the proportion equation
   259,111.22 : 388,680.78 = 81,632.12 : x
2. Step 2: Convert to fraction form
   259,111.22/388,680.78 = 81,632.12/x
3. Step 3: Cross multiply
   259,111.22x = 388,680.78 × 81,632.12
4. Step 4: Simplify right side
   259,111.22x = 31,728,836,074.65
5. Step 5: Solve for x
   x = 31,728,836,074.65/259,111.22
6. Step 6: Final answer
   x = 122,452.57