Finding the Fourth Proportional to 2,413.67, 3,619.57 and 853.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,413.67 : 3,619.57 = 853.38 : x
2. Step 2: Convert to fraction form
   2,413.67/3,619.57 = 853.38/x
3. Step 3: Cross multiply
   2,413.67x = 3,619.57 × 853.38
4. Step 4: Simplify right side
   2,413.67x = 3,088,868.65
5. Step 5: Solve for x
   x = 3,088,868.65/2,413.67
6. Step 6: Final answer
   x = 1,279.74