Finding the Third Proportional to 20,868 and 45,678

Step by Step Solution

1. Step 1: Write the proportion equation
   20,868 : 45,678 = 45,678 : x
2. Step 2: Convert to fraction form
   20,868/45,678 = 45,678/x
3. Step 3: Cross multiply
   20,868x = 45,678 × 45,678
4. Step 4: Simplify right side
   20,868x = 2,086,479,684
5. Step 5: Solve for x
   x = 2,086,479,684/20,868
6. Step 6: Final answer
   x = 99,984.65