Finding the Fourth Proportional to 9,144.20, 12,621.12 and 5,367.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.20 : 12,621.12 = 5,367.80 : x
2. Step 2: Convert to fraction form
   9,144.20/12,621.12 = 5,367.80/x
3. Step 3: Cross multiply
   9,144.20x = 12,621.12 × 5,367.80
4. Step 4: Simplify right side
   9,144.20x = 67,747,647.94
5. Step 5: Solve for x
   x = 67,747,647.94/9,144.20
6. Step 6: Final answer
   x = 7,408.81