Finding the Fourth Proportional to 9,144.72, 12,619.72 and 5,367.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.72 : 12,619.72 = 5,367.15 : x
2. Step 2: Convert to fraction form
   9,144.72/12,619.72 = 5,367.15/x
3. Step 3: Cross multiply
   9,144.72x = 12,619.72 × 5,367.15
4. Step 4: Simplify right side
   9,144.72x = 67,731,853.68
5. Step 5: Solve for x
   x = 67,731,853.68/9,144.72
6. Step 6: Final answer
   x = 7,406.67