Finding the Fourth Proportional to 3,986.78, 5,501.78 and 2,413.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986.78 : 5,501.78 = 2,413.76 : x
2. Step 2: Convert to fraction form
   3,986.78/5,501.78 = 2,413.76/x
3. Step 3: Cross multiply
   3,986.78x = 5,501.78 × 2,413.76
4. Step 4: Simplify right side
   3,986.78x = 13,279,976.49
5. Step 5: Solve for x
   x = 13,279,976.49/3,986.78
6. Step 6: Final answer
   x = 3,331.00