Finding the Fourth Proportional to 9,890.13, 13,648.28 and 5,413.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,890.13 : 13,648.28 = 5,413.89 : x
2. Step 2: Convert to fraction form
   9,890.13/13,648.28 = 5,413.89/x
3. Step 3: Cross multiply
   9,890.13x = 13,648.28 × 5,413.89
4. Step 4: Simplify right side
   9,890.13x = 73,890,259.54
5. Step 5: Solve for x
   x = 73,890,259.54/9,890.13
6. Step 6: Final answer
   x = 7,471.11