Finding the Fourth Proportional to 13,393.96, 18,483.46 and 7,728.71

Step by Step Solution

1. Step 1: Write the proportion equation
   13,393.96 : 18,483.46 = 7,728.71 : x
2. Step 2: Convert to fraction form
   13,393.96/18,483.46 = 7,728.71/x
3. Step 3: Cross multiply
   13,393.96x = 18,483.46 × 7,728.71
4. Step 4: Simplify right side
   13,393.96x = 142,853,302.14
5. Step 5: Solve for x
   x = 142,853,302.14/13,393.96
6. Step 6: Final answer
   x = 10,665.50