Finding the Fourth Proportional to 12,424.57, 17,142.51 and 8,643.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,424.57 : 17,142.51 = 8,643.49 : x
2. Step 2: Convert to fraction form
   12,424.57/17,142.51 = 8,643.49/x
3. Step 3: Cross multiply
   12,424.57x = 17,142.51 × 8,643.49
4. Step 4: Simplify right side
   12,424.57x = 148,171,113.76
5. Step 5: Solve for x
   x = 148,171,113.76/12,424.57
6. Step 6: Final answer
   x = 11,925.65