Finding the Fourth Proportional to 258,595.38, 387,892.89 and 81,116.10

Step by Step Solution

1. Step 1: Write the proportion equation
   258,595.38 : 387,892.89 = 81,116.10 : x
2. Step 2: Convert to fraction form
   258,595.38/387,892.89 = 81,116.10/x
3. Step 3: Cross multiply
   258,595.38x = 387,892.89 × 81,116.10
4. Step 4: Simplify right side
   258,595.38x = 31,464,358,454.53
5. Step 5: Solve for x
   x = 31,464,358,454.53/258,595.38
6. Step 6: Final answer
   x = 121,674.09