Finding the Fourth Proportional to 76,388.57, 105,413.10 and 42,398.49

Step by Step Solution

1. Step 1: Write the proportion equation
   76,388.57 : 105,413.10 = 42,398.49 : x
2. Step 2: Convert to fraction form
   76,388.57/105,413.10 = 42,398.49/x
3. Step 3: Cross multiply
   76,388.57x = 105,413.10 × 42,398.49
4. Step 4: Simplify right side
   76,388.57x = 4,469,355,613.10
5. Step 5: Solve for x
   x = 4,469,355,613.10/76,388.57
6. Step 6: Final answer
   x = 58,508.18