Finding the Third Proportional to 10,454 and 21,421

Step by Step Solution

1. Step 1: Write the proportion equation
   10,454 : 21,421 = 21,421 : x
2. Step 2: Convert to fraction form
   10,454/21,421 = 21,421/x
3. Step 3: Cross multiply
   10,454x = 21,421 × 21,421
4. Step 4: Simplify right side
   10,454x = 458,859,241
5. Step 5: Solve for x
   x = 458,859,241/10,454
6. Step 6: Final answer
   x = 43,893.17