Finding the Fourth Proportional to 140,642.06, 194,087.87 and 76,978.49

Step by Step Solution

1. Step 1: Write the proportion equation
   140,642.06 : 194,087.87 = 76,978.49 : x
2. Step 2: Convert to fraction form
   140,642.06/194,087.87 = 76,978.49/x
3. Step 3: Cross multiply
   140,642.06x = 194,087.87 × 76,978.49
4. Step 4: Simplify right side
   140,642.06x = 14,940,591,837.58
5. Step 5: Solve for x
   x = 14,940,591,837.58/140,642.06
6. Step 6: Final answer
   x = 106,231.32