Finding the Fourth Proportional to 9,889.39, 13,647.25 and 5,413.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,889.39 : 13,647.25 = 5,413.09 : x
2. Step 2: Convert to fraction form
   9,889.39/13,647.25 = 5,413.09/x
3. Step 3: Cross multiply
   9,889.39x = 13,647.25 × 5,413.09
4. Step 4: Simplify right side
   9,889.39x = 73,873,792.50
5. Step 5: Solve for x
   x = 73,873,792.50/9,889.39
6. Step 6: Final answer
   x = 7,470.01