Finding the Fourth Proportional to 78,878.72, 108,967.79 and 68,249.90

Step by Step Solution

1. Step 1: Write the proportion equation
   78,878.72 : 108,967.79 = 68,249.90 : x
2. Step 2: Convert to fraction form
   78,878.72/108,967.79 = 68,249.90/x
3. Step 3: Cross multiply
   78,878.72x = 108,967.79 × 68,249.90
4. Step 4: Simplify right side
   78,878.72x = 7,437,040,770.72
5. Step 5: Solve for x
   x = 7,437,040,770.72/78,878.72
6. Step 6: Final answer
   x = 94,284.50