Finding the Fourth Proportional to 12,449.61, 17,179.41 and 7,143.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,449.61 : 17,179.41 = 7,143.30 : x
2. Step 2: Convert to fraction form
   12,449.61/17,179.41 = 7,143.30/x
3. Step 3: Cross multiply
   12,449.61x = 17,179.41 × 7,143.30
4. Step 4: Simplify right side
   12,449.61x = 122,717,679.45
5. Step 5: Solve for x
   x = 122,717,679.45/12,449.61
6. Step 6: Final answer
   x = 9,857.15