Finding the Third Proportional to 6,399 and 13,242

Step by Step Solution

1. Step 1: Write the proportion equation
   6,399 : 13,242 = 13,242 : x
2. Step 2: Convert to fraction form
   6,399/13,242 = 13,242/x
3. Step 3: Cross multiply
   6,399x = 13,242 × 13,242
4. Step 4: Simplify right side
   6,399x = 175,350,564
5. Step 5: Solve for x
   x = 175,350,564/6,399
6. Step 6: Final answer
   x = 27,402.81