Finding the Fourth Proportional to 258,196.05, 387,297.72 and 68,659.68

Step by Step Solution

1. Step 1: Write the proportion equation
   258,196.05 : 387,297.72 = 68,659.68 : x
2. Step 2: Convert to fraction form
   258,196.05/387,297.72 = 68,659.68/x
3. Step 3: Cross multiply
   258,196.05x = 387,297.72 × 68,659.68
4. Step 4: Simplify right side
   258,196.05x = 26,591,737,519.93
5. Step 5: Solve for x
   x = 26,591,737,519.93/258,196.05
6. Step 6: Final answer
   x = 102,990.49