Finding the Fourth Proportional to 12,443.90, 17,163.09 and 8,458.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.90 : 17,163.09 = 8,458.29 : x
2. Step 2: Convert to fraction form
   12,443.90/17,163.09 = 8,458.29/x
3. Step 3: Cross multiply
   12,443.90x = 17,163.09 × 8,458.29
4. Step 4: Simplify right side
   12,443.90x = 145,170,392.52
5. Step 5: Solve for x
   x = 145,170,392.52/12,443.90
6. Step 6: Final answer
   x = 11,665.99