Finding the Fourth Proportional to 12,162.86, 18,251.49 and 5,142.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,162.86 : 18,251.49 = 5,142.49 : x
2. Step 2: Convert to fraction form
   12,162.86/18,251.49 = 5,142.49/x
3. Step 3: Cross multiply
   12,162.86x = 18,251.49 × 5,142.49
4. Step 4: Simplify right side
   12,162.86x = 93,858,078.47
5. Step 5: Solve for x
   x = 93,858,078.47/12,162.86
6. Step 6: Final answer
   x = 7,716.78