Finding the Third Proportional to 9,842 and 21,143

Step by Step Solution

1. Step 1: Write the proportion equation
   9,842 : 21,143 = 21,143 : x
2. Step 2: Convert to fraction form
   9,842/21,143 = 21,143/x
3. Step 3: Cross multiply
   9,842x = 21,143 × 21,143
4. Step 4: Simplify right side
   9,842x = 447,026,449
5. Step 5: Solve for x
   x = 447,026,449/9,842
6. Step 6: Final answer
   x = 45,420.29