Finding the Third Proportional to 10,105 and 21,505

Step by Step Solution

1. Step 1: Write the proportion equation
   10,105 : 21,505 = 21,505 : x
2. Step 2: Convert to fraction form
   10,105/21,505 = 21,505/x
3. Step 3: Cross multiply
   10,105x = 21,505 × 21,505
4. Step 4: Simplify right side
   10,105x = 462,465,025
5. Step 5: Solve for x
   x = 462,465,025/10,105
6. Step 6: Final answer
   x = 45,765.96