Finding the Fourth Proportional to 78,517.89, 108,356.13 and 42,708.20

Step by Step Solution

1. Step 1: Write the proportion equation
   78,517.89 : 108,356.13 = 42,708.20 : x
2. Step 2: Convert to fraction form
   78,517.89/108,356.13 = 42,708.20/x
3. Step 3: Cross multiply
   78,517.89x = 108,356.13 × 42,708.20
4. Step 4: Simplify right side
   78,517.89x = 4,627,694,729.49
5. Step 5: Solve for x
   x = 4,627,694,729.49/78,517.89
6. Step 6: Final answer
   x = 58,938.09