Finding the Fourth Proportional to 125,978.79, 173,844.17 and 78,231.12

Step by Step Solution

1. Step 1: Write the proportion equation
   125,978.79 : 173,844.17 = 78,231.12 : x
2. Step 2: Convert to fraction form
   125,978.79/173,844.17 = 78,231.12/x
3. Step 3: Cross multiply
   125,978.79x = 173,844.17 × 78,231.12
4. Step 4: Simplify right side
   125,978.79x = 13,600,023,814.92
5. Step 5: Solve for x
   x = 13,600,023,814.92/125,978.79
6. Step 6: Final answer
   x = 107,954.87