Finding the Fourth Proportional to 12,648.96, 18,983.12 and 5,728.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,648.96 : 18,983.12 = 5,728.32 : x
2. Step 2: Convert to fraction form
   12,648.96/18,983.12 = 5,728.32/x
3. Step 3: Cross multiply
   12,648.96x = 18,983.12 × 5,728.32
4. Step 4: Simplify right side
   12,648.96x = 108,741,385.96
5. Step 5: Solve for x
   x = 108,741,385.96/12,648.96
6. Step 6: Final answer
   x = 8,596.86