Finding the Fourth Proportional to 12,438.72, 17,167 and 7,723.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,438.72 : 17,167 = 7,723.72 : x
2. Step 2: Convert to fraction form
   12,438.72/17,167 = 7,723.72/x
3. Step 3: Cross multiply
   12,438.72x = 17,167 × 7,723.72
4. Step 4: Simplify right side
   12,438.72x = 132,593,101.24
5. Step 5: Solve for x
   x = 132,593,101.24/12,438.72
6. Step 6: Final answer
   x = 10,659.71