Finding the Fourth Proportional to 78,718.98, 108,633.92 and 42,910.78

Step by Step Solution

1. Step 1: Write the proportion equation
   78,718.98 : 108,633.92 = 42,910.78 : x
2. Step 2: Convert to fraction form
   78,718.98/108,633.92 = 42,910.78/x
3. Step 3: Cross multiply
   78,718.98x = 108,633.92 × 42,910.78
4. Step 4: Simplify right side
   78,718.98x = 4,661,566,241.66
5. Step 5: Solve for x
   x = 4,661,566,241.66/78,718.98
6. Step 6: Final answer
   x = 59,217.82