Finding the Fourth Proportional to 76,839.26, 105,978.55 and 68,234.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,839.26 : 105,978.55 = 68,234.50 : x
2. Step 2: Convert to fraction form
   76,839.26/105,978.55 = 68,234.50/x
3. Step 3: Cross multiply
   76,839.26x = 105,978.55 × 68,234.50
4. Step 4: Simplify right side
   76,839.26x = 7,231,393,369.98
5. Step 5: Solve for x
   x = 7,231,393,369.98/76,839.26
6. Step 6: Final answer
   x = 94,110.66