Finding the Fourth Proportional to 2,413.52, 3,620.58 and 853.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,413.52 : 3,620.58 = 853.20 : x
2. Step 2: Convert to fraction form
   2,413.52/3,620.58 = 853.20/x
3. Step 3: Cross multiply
   2,413.52x = 3,620.58 × 853.20
4. Step 4: Simplify right side
   2,413.52x = 3,089,087.91
5. Step 5: Solve for x
   x = 3,089,087.91/2,413.52
6. Step 6: Final answer
   x = 1,279.91