Finding the Third Proportional to 10,239 and 21,570

Step by Step Solution

1. Step 1: Write the proportion equation
   10,239 : 21,570 = 21,570 : x
2. Step 2: Convert to fraction form
   10,239/21,570 = 21,570/x
3. Step 3: Cross multiply
   10,239x = 21,570 × 21,570
4. Step 4: Simplify right side
   10,239x = 465,264,900
5. Step 5: Solve for x
   x = 465,264,900/10,239
6. Step 6: Final answer
   x = 45,440.46