Finding the Third Proportional to 2,491.31 and 5,286.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,491.31 : 5,286.38 = 5,286.38 : x
2. Step 2: Convert to fraction form
   2,491.31/5,286.38 = 5,286.38/x
3. Step 3: Cross multiply
   2,491.31x = 5,286.38 × 5,286.38
4. Step 4: Simplify right side
   2,491.31x = 27,945,760.64
5. Step 5: Solve for x
   x = 27,945,760.64/2,491.31
6. Step 6: Final answer
   x = 11,217.28