Finding the Fourth Proportional to 259,078.72, 388,632.01 and 81,599.62

Step by Step Solution

1. Step 1: Write the proportion equation
   259,078.72 : 388,632.01 = 81,599.62 : x
2. Step 2: Convert to fraction form
   259,078.72/388,632.01 = 81,599.62/x
3. Step 3: Cross multiply
   259,078.72x = 388,632.01 × 81,599.62
4. Step 4: Simplify right side
   259,078.72x = 31,712,224,335.84
5. Step 5: Solve for x
   x = 31,712,224,335.84/259,078.72
6. Step 6: Final answer
   x = 122,403.82