Finding the Fourth Proportional to 259,042.86, 388,530.27 and 81,550.80

Step by Step Solution

1. Step 1: Write the proportion equation
   259,042.86 : 388,530.27 = 81,550.80 : x
2. Step 2: Convert to fraction form
   259,042.86/388,530.27 = 81,550.80/x
3. Step 3: Cross multiply
   259,042.86x = 388,530.27 × 81,550.80
4. Step 4: Simplify right side
   259,042.86x = 31,684,954,342.72
5. Step 5: Solve for x
   x = 31,684,954,342.72/259,042.86
6. Step 6: Final answer
   x = 122,315.49