Finding the Fourth Proportional to 258,354.15, 387,605.34 and 108,517.38

Step by Step Solution

1. Step 1: Write the proportion equation
   258,354.15 : 387,605.34 = 108,517.38 : x
2. Step 2: Convert to fraction form
   258,354.15/387,605.34 = 108,517.38/x
3. Step 3: Cross multiply
   258,354.15x = 387,605.34 × 108,517.38
4. Step 4: Simplify right side
   258,354.15x = 42,061,915,970.81
5. Step 5: Solve for x
   x = 42,061,915,970.81/258,354.15
6. Step 6: Final answer
   x = 162,807.20