Finding the Fourth Proportional to 78,717.98, 108,632.54 and 42,909.78

Step by Step Solution

1. Step 1: Write the proportion equation
   78,717.98 : 108,632.54 = 42,909.78 : x
2. Step 2: Convert to fraction form
   78,717.98/108,632.54 = 42,909.78/x
3. Step 3: Cross multiply
   78,717.98x = 108,632.54 × 42,909.78
4. Step 4: Simplify right side
   78,717.98x = 4,661,398,392.24
5. Step 5: Solve for x
   x = 4,661,398,392.24/78,717.98
6. Step 6: Final answer
   x = 59,216.44