Finding the Fourth Proportional to 9,144.70, 12,619.58 and 5,367.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.70 : 12,619.58 = 5,367.20 : x
2. Step 2: Convert to fraction form
   9,144.70/12,619.58 = 5,367.20/x
3. Step 3: Cross multiply
   9,144.70x = 12,619.58 × 5,367.20
4. Step 4: Simplify right side
   9,144.70x = 67,731,809.78
5. Step 5: Solve for x
   x = 67,731,809.78/9,144.70
6. Step 6: Final answer
   x = 7,406.67