Finding the Fourth Proportional to 13,540.72, 18,668.28 and 9,760.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,540.72 : 18,668.28 = 9,760.72 : x
2. Step 2: Convert to fraction form
   13,540.72/18,668.28 = 9,760.72/x
3. Step 3: Cross multiply
   13,540.72x = 18,668.28 × 9,760.72
4. Step 4: Simplify right side
   13,540.72x = 182,215,853.96
5. Step 5: Solve for x
   x = 182,215,853.96/13,540.72
6. Step 6: Final answer
   x = 13,456.88