Finding the Fourth Proportional to 12,271.79, 18,413.15 and 4,478.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,271.79 : 18,413.15 = 4,478.78 : x
2. Step 2: Convert to fraction form
   12,271.79/18,413.15 = 4,478.78/x
3. Step 3: Cross multiply
   12,271.79x = 18,413.15 × 4,478.78
4. Step 4: Simplify right side
   12,271.79x = 82,468,447.96
5. Step 5: Solve for x
   x = 82,468,447.96/12,271.79
6. Step 6: Final answer
   x = 6,720.16