Finding the Fourth Proportional to 126,910.61, 175,117.71 and 78,561.17

Step by Step Solution

1. Step 1: Write the proportion equation
   126,910.61 : 175,117.71 = 78,561.17 : x
2. Step 2: Convert to fraction form
   126,910.61/175,117.71 = 78,561.17/x
3. Step 3: Cross multiply
   126,910.61x = 175,117.71 × 78,561.17
4. Step 4: Simplify right side
   126,910.61x = 13,757,451,309.73
5. Step 5: Solve for x
   x = 13,757,451,309.73/126,910.61
6. Step 6: Final answer
   x = 108,402.69