Finding the Fourth Proportional to 2,413.82, 3,620.39 and 853.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,413.82 : 3,620.39 = 853.76 : x
2. Step 2: Convert to fraction form
   2,413.82/3,620.39 = 853.76/x
3. Step 3: Cross multiply
   2,413.82x = 3,620.39 × 853.76
4. Step 4: Simplify right side
   2,413.82x = 3,090,921.80
5. Step 5: Solve for x
   x = 3,090,921.80/2,413.82
6. Step 6: Final answer
   x = 1,280.51