Finding the Fourth Proportional to 8,168.11, 12,231.30 and 5,386.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,168.11 : 12,231.30 = 5,386.38 : x
2. Step 2: Convert to fraction form
   8,168.11/12,231.30 = 5,386.38/x
3. Step 3: Cross multiply
   8,168.11x = 12,231.30 × 5,386.38
4. Step 4: Simplify right side
   8,168.11x = 65,882,429.69
5. Step 5: Solve for x
   x = 65,882,429.69/8,168.11
6. Step 6: Final answer
   x = 8,065.81