Finding the Fourth Proportional to 12,422, 17,133.68 and 8,171.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,422 : 17,133.68 = 8,171.72 : x
2. Step 2: Convert to fraction form
   12,422/17,133.68 = 8,171.72/x
3. Step 3: Cross multiply
   12,422x = 17,133.68 × 8,171.72
4. Step 4: Simplify right side
   12,422x = 140,011,635.53
5. Step 5: Solve for x
   x = 140,011,635.53/12,422
6. Step 6: Final answer
   x = 11,271.26