Finding the Fourth Proportional to 9,391.86, 12,960.34 and 5,413.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,391.86 : 12,960.34 = 5,413.56 : x
2. Step 2: Convert to fraction form
   9,391.86/12,960.34 = 5,413.56/x
3. Step 3: Cross multiply
   9,391.86x = 12,960.34 × 5,413.56
4. Step 4: Simplify right side
   9,391.86x = 70,161,578.21
5. Step 5: Solve for x
   x = 70,161,578.21/9,391.86
6. Step 6: Final answer
   x = 7,470.47