Finding the Fourth Proportional to 2,491.72, 3,413.67 and 2,398.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,491.72 : 3,413.67 = 2,398.30 : x
2. Step 2: Convert to fraction form
   2,491.72/3,413.67 = 2,398.30/x
3. Step 3: Cross multiply
   2,491.72x = 3,413.67 × 2,398.30
4. Step 4: Simplify right side
   2,491.72x = 8,187,010.76
5. Step 5: Solve for x
   x = 8,187,010.76/2,491.72
6. Step 6: Final answer
   x = 3,285.69