Finding the Fourth Proportional to 8,728.94, 12,039.72 and 5,367.35

Step by Step Solution

1. Step 1: Write the proportion equation
   8,728.94 : 12,039.72 = 5,367.35 : x
2. Step 2: Convert to fraction form
   8,728.94/12,039.72 = 5,367.35/x
3. Step 3: Cross multiply
   8,728.94x = 12,039.72 × 5,367.35
4. Step 4: Simplify right side
   8,728.94x = 64,621,391.14
5. Step 5: Solve for x
   x = 64,621,391.14/8,728.94
6. Step 6: Final answer
   x = 7,403.12