Finding the Third Proportional to 8,458 and 13,018

Step by Step Solution

1. Step 1: Write the proportion equation
   8,458 : 13,018 = 13,018 : x
2. Step 2: Convert to fraction form
   8,458/13,018 = 13,018/x
3. Step 3: Cross multiply
   8,458x = 13,018 × 13,018
4. Step 4: Simplify right side
   8,458x = 169,468,324
5. Step 5: Solve for x
   x = 169,468,324/8,458
6. Step 6: Final answer
   x = 20,036.45