Finding the Fourth Proportional to 9,413.30, 12,964.05 and 9,209.22

Step by Step Solution

1. Step 1: Write the proportion equation
   9,413.30 : 12,964.05 = 9,209.22 : x
2. Step 2: Convert to fraction form
   9,413.30/12,964.05 = 9,209.22/x
3. Step 3: Cross multiply
   9,413.30x = 12,964.05 × 9,209.22
4. Step 4: Simplify right side
   9,413.30x = 119,388,788.54
5. Step 5: Solve for x
   x = 119,388,788.54/9,413.30
6. Step 6: Final answer
   x = 12,682.99