Finding the Fourth Proportional to 78,517.35, 108,355.73 and 42,709.28

Step by Step Solution

1. Step 1: Write the proportion equation
   78,517.35 : 108,355.73 = 42,709.28 : x
2. Step 2: Convert to fraction form
   78,517.35/108,355.73 = 42,709.28/x
3. Step 3: Cross multiply
   78,517.35x = 108,355.73 × 42,709.28
4. Step 4: Simplify right side
   78,517.35x = 4,627,794,456.85
5. Step 5: Solve for x
   x = 4,627,794,456.85/78,517.35
6. Step 6: Final answer
   x = 58,939.77