Finding the Fourth Proportional to 13,251, 18,289.68 and 7,665.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,251 : 18,289.68 = 7,665.24 : x
2. Step 2: Convert to fraction form
   13,251/18,289.68 = 7,665.24/x
3. Step 3: Cross multiply
   13,251x = 18,289.68 × 7,665.24
4. Step 4: Simplify right side
   13,251x = 140,194,786.72
5. Step 5: Solve for x
   x = 140,194,786.72/13,251
6. Step 6: Final answer
   x = 10,579.94