Finding the Fourth Proportional to 13,728.32, 18,945.18 and 7,440.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,728.32 : 18,945.18 = 7,440.69 : x
2. Step 2: Convert to fraction form
   13,728.32/18,945.18 = 7,440.69/x
3. Step 3: Cross multiply
   13,728.32x = 18,945.18 × 7,440.69
4. Step 4: Simplify right side
   13,728.32x = 140,965,282.42
5. Step 5: Solve for x
   x = 140,965,282.42/13,728.32
6. Step 6: Final answer
   x = 10,268.21