Finding the Fourth Proportional to 12,447.94, 17,178.24 and 7,142.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,447.94 : 17,178.24 = 7,142.62 : x
2. Step 2: Convert to fraction form
   12,447.94/17,178.24 = 7,142.62/x
3. Step 3: Cross multiply
   12,447.94x = 17,178.24 × 7,142.62
4. Step 4: Simplify right side
   12,447.94x = 122,697,640.59
5. Step 5: Solve for x
   x = 122,697,640.59/12,447.94
6. Step 6: Final answer
   x = 9,856.86