Finding the Fourth Proportional to 78,517.50, 108,356.36 and 42,709.80

Step by Step Solution

1. Step 1: Write the proportion equation
   78,517.50 : 108,356.36 = 42,709.80 : x
2. Step 2: Convert to fraction form
   78,517.50/108,356.36 = 42,709.80/x
3. Step 3: Cross multiply
   78,517.50x = 108,356.36 × 42,709.80
4. Step 4: Simplify right side
   78,517.50x = 4,627,878,464.33
5. Step 5: Solve for x
   x = 4,627,878,464.33/78,517.50
6. Step 6: Final answer
   x = 58,940.73