Finding the Fourth Proportional to 9,890.61, 13,648.51 and 5,413.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,890.61 : 13,648.51 = 5,413.49 : x
2. Step 2: Convert to fraction form
   9,890.61/13,648.51 = 5,413.49/x
3. Step 3: Cross multiply
   9,890.61x = 13,648.51 × 5,413.49
4. Step 4: Simplify right side
   9,890.61x = 73,886,072.40
5. Step 5: Solve for x
   x = 73,886,072.40/9,890.61
6. Step 6: Final answer
   x = 7,470.33