Finding the Fourth Proportional to 9,390.48, 12,960.45 and 5,413.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,390.48 : 12,960.45 = 5,413.92 : x
2. Step 2: Convert to fraction form
   9,390.48/12,960.45 = 5,413.92/x
3. Step 3: Cross multiply
   9,390.48x = 12,960.45 × 5,413.92
4. Step 4: Simplify right side
   9,390.48x = 70,166,839.46
5. Step 5: Solve for x
   x = 70,166,839.46/9,390.48
6. Step 6: Final answer
   x = 7,472.12