Finding the Fourth Proportional to 258,827.83, 388,223.18 and 81,385.59

Step by Step Solution

1. Step 1: Write the proportion equation
   258,827.83 : 388,223.18 = 81,385.59 : x
2. Step 2: Convert to fraction form
   258,827.83/388,223.18 = 81,385.59/x
3. Step 3: Cross multiply
   258,827.83x = 388,223.18 × 81,385.59
4. Step 4: Simplify right side
   258,827.83x = 31,595,770,634.45
5. Step 5: Solve for x
   x = 31,595,770,634.45/258,827.83
6. Step 6: Final answer
   x = 122,072.54