Finding the Fourth Proportional to 12,429.02, 17,143.37 and 8,443.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.02 : 17,143.37 = 8,443.21 : x
2. Step 2: Convert to fraction form
   12,429.02/17,143.37 = 8,443.21/x
3. Step 3: Cross multiply
   12,429.02x = 17,143.37 × 8,443.21
4. Step 4: Simplify right side
   12,429.02x = 144,745,073.02
5. Step 5: Solve for x
   x = 144,745,073.02/12,429.02
6. Step 6: Final answer
   x = 11,645.73