Finding the Third Proportional to 3,938 and 10,421

Step by Step Solution

1. Step 1: Write the proportion equation
   3,938 : 10,421 = 10,421 : x
2. Step 2: Convert to fraction form
   3,938/10,421 = 10,421/x
3. Step 3: Cross multiply
   3,938x = 10,421 × 10,421
4. Step 4: Simplify right side
   3,938x = 108,597,241
5. Step 5: Solve for x
   x = 108,597,241/3,938
6. Step 6: Final answer
   x = 27,576.75