Finding the Fourth Proportional to 78,138.56, 107,831.72 and 42,328.56

Step by Step Solution

1. Step 1: Write the proportion equation
   78,138.56 : 107,831.72 = 42,328.56 : x
2. Step 2: Convert to fraction form
   78,138.56/107,831.72 = 42,328.56/x
3. Step 3: Cross multiply
   78,138.56x = 107,831.72 × 42,328.56
4. Step 4: Simplify right side
   78,138.56x = 4,564,361,429.92
5. Step 5: Solve for x
   x = 4,564,361,429.92/78,138.56
6. Step 6: Final answer
   x = 58,413.69