Finding the Third Proportional to 9,868 and 21,143

Step by Step Solution

1. Step 1: Write the proportion equation
   9,868 : 21,143 = 21,143 : x
2. Step 2: Convert to fraction form
   9,868/21,143 = 21,143/x
3. Step 3: Cross multiply
   9,868x = 21,143 × 21,143
4. Step 4: Simplify right side
   9,868x = 447,026,449
5. Step 5: Solve for x
   x = 447,026,449/9,868
6. Step 6: Final answer
   x = 45,300.61