Finding the Fourth Proportional to 78,438.24, 108,245.28 and 42,628.56

Step by Step Solution

1. Step 1: Write the proportion equation
   78,438.24 : 108,245.28 = 42,628.56 : x
2. Step 2: Convert to fraction form
   78,438.24/108,245.28 = 42,628.56/x
3. Step 3: Cross multiply
   78,438.24x = 108,245.28 × 42,628.56
4. Step 4: Simplify right side
   78,438.24x = 4,614,340,413.20
5. Step 5: Solve for x
   x = 4,614,340,413.20/78,438.24
6. Step 6: Final answer
   x = 58,827.69