Finding the Third Proportional to 10,455 and 21,423

Step by Step Solution

1. Step 1: Write the proportion equation
   10,455 : 21,423 = 21,423 : x
2. Step 2: Convert to fraction form
   10,455/21,423 = 21,423/x
3. Step 3: Cross multiply
   10,455x = 21,423 × 21,423
4. Step 4: Simplify right side
   10,455x = 458,944,929
5. Step 5: Solve for x
   x = 458,944,929/10,455
6. Step 6: Final answer
   x = 43,897.17