Finding the Fourth Proportional to 12,413.72, 18,620.76 and 3,648.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,413.72 : 18,620.76 = 3,648.80 : x
2. Step 2: Convert to fraction form
   12,413.72/18,620.76 = 3,648.80/x
3. Step 3: Cross multiply
   12,413.72x = 18,620.76 × 3,648.80
4. Step 4: Simplify right side
   12,413.72x = 67,943,429.09
5. Step 5: Solve for x
   x = 67,943,429.09/12,413.72
6. Step 6: Final answer
   x = 5,473.25