Finding the Fourth Proportional to 2,413.56, 3,619.86 and 681.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,413.56 : 3,619.86 = 681.78 : x
2. Step 2: Convert to fraction form
   2,413.56/3,619.86 = 681.78/x
3. Step 3: Cross multiply
   2,413.56x = 3,619.86 × 681.78
4. Step 4: Simplify right side
   2,413.56x = 2,467,948.15
5. Step 5: Solve for x
   x = 2,467,948.15/2,413.56
6. Step 6: Final answer
   x = 1,022.53