Finding the Third Proportional to 9,861 and 21,450

Step by Step Solution

1. Step 1: Write the proportion equation
   9,861 : 21,450 = 21,450 : x
2. Step 2: Convert to fraction form
   9,861/21,450 = 21,450/x
3. Step 3: Cross multiply
   9,861x = 21,450 × 21,450
4. Step 4: Simplify right side
   9,861x = 460,102,500
5. Step 5: Solve for x
   x = 460,102,500/9,861
6. Step 6: Final answer
   x = 46,658.81