Finding the Fourth Proportional to 9,413.81, 12,991.06 and 5,222.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,413.81 : 12,991.06 = 5,222.06 : x
2. Step 2: Convert to fraction form
   9,413.81/12,991.06 = 5,222.06/x
3. Step 3: Cross multiply
   9,413.81x = 12,991.06 × 5,222.06
4. Step 4: Simplify right side
   9,413.81x = 67,840,003.72
5. Step 5: Solve for x
   x = 67,840,003.72/9,413.81
6. Step 6: Final answer
   x = 7,206.44