Finding the Fourth Proportional to 13,728.50, 18,945.42 and 7,440.92

Step by Step Solution

1. Step 1: Write the proportion equation
   13,728.50 : 18,945.42 = 7,440.92 : x
2. Step 2: Convert to fraction form
   13,728.50/18,945.42 = 7,440.92/x
3. Step 3: Cross multiply
   13,728.50x = 18,945.42 × 7,440.92
4. Step 4: Simplify right side
   13,728.50x = 140,971,354.59
5. Step 5: Solve for x
   x = 140,971,354.59/13,728.50
6. Step 6: Final answer
   x = 10,268.52