Finding the Fourth Proportional to 9,413.44, 12,990.72 and 5,221.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,413.44 : 12,990.72 = 5,221.92 : x
2. Step 2: Convert to fraction form
   9,413.44/12,990.72 = 5,221.92/x
3. Step 3: Cross multiply
   9,413.44x = 12,990.72 × 5,221.92
4. Step 4: Simplify right side
   9,413.44x = 67,836,500.58
5. Step 5: Solve for x
   x = 67,836,500.58/9,413.44
6. Step 6: Final answer
   x = 7,206.35