Finding the Third Proportional to 9,864 and 21,571

Step by Step Solution

1. Step 1: Write the proportion equation
   9,864 : 21,571 = 21,571 : x
2. Step 2: Convert to fraction form
   9,864/21,571 = 21,571/x
3. Step 3: Cross multiply
   9,864x = 21,571 × 21,571
4. Step 4: Simplify right side
   9,864x = 465,308,041
5. Step 5: Solve for x
   x = 465,308,041/9,864
6. Step 6: Final answer
   x = 47,172.35