Finding the Fourth Proportional to 9,413.99, 12,991.31 and 5,222.24

Step by Step Solution

1. Step 1: Write the proportion equation
   9,413.99 : 12,991.31 = 5,222.24 : x
2. Step 2: Convert to fraction form
   9,413.99/12,991.31 = 5,222.24/x
3. Step 3: Cross multiply
   9,413.99x = 12,991.31 × 5,222.24
4. Step 4: Simplify right side
   9,413.99x = 67,843,715.97
5. Step 5: Solve for x
   x = 67,843,715.97/9,413.99
6. Step 6: Final answer
   x = 7,206.69