Finding the Fourth Proportional to 13,728.18, 18,944.89 and 7,440.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,728.18 : 18,944.89 = 7,440.56 : x
2. Step 2: Convert to fraction form
   13,728.18/18,944.89 = 7,440.56/x
3. Step 3: Cross multiply
   13,728.18x = 18,944.89 × 7,440.56
4. Step 4: Simplify right side
   13,728.18x = 140,960,590.74
5. Step 5: Solve for x
   x = 140,960,590.74/13,728.18
6. Step 6: Final answer
   x = 10,267.97