Finding the Third Proportional to 3,939.75 and 8,401.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,939.75 : 8,401.25 = 8,401.25 : x
2. Step 2: Convert to fraction form
   3,939.75/8,401.25 = 8,401.25/x
3. Step 3: Cross multiply
   3,939.75x = 8,401.25 × 8,401.25
4. Step 4: Simplify right side
   3,939.75x = 70,581,001.56
5. Step 5: Solve for x
   x = 70,581,001.56/3,939.75
6. Step 6: Final answer
   x = 17,915.10