Finding the Third Proportional to 12,621 and 21,024

Step by Step Solution

1. Step 1: Write the proportion equation
   12,621 : 21,024 = 21,024 : x
2. Step 2: Convert to fraction form
   12,621/21,024 = 21,024/x
3. Step 3: Cross multiply
   12,621x = 21,024 × 21,024
4. Step 4: Simplify right side
   12,621x = 442,008,576
5. Step 5: Solve for x
   x = 442,008,576/12,621
6. Step 6: Final answer
   x = 35,021.68