Finding the Fourth Proportional to 8,947.89, 12,347.51 and 5,413.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,947.89 : 12,347.51 = 5,413.05 : x
2. Step 2: Convert to fraction form
   8,947.89/12,347.51 = 5,413.05/x
3. Step 3: Cross multiply
   8,947.89x = 12,347.51 × 5,413.05
4. Step 4: Simplify right side
   8,947.89x = 66,837,661.94
5. Step 5: Solve for x
   x = 66,837,661.94/8,947.89
6. Step 6: Final answer
   x = 7,469.66