Finding the Third Proportional to 3,992.75 and 8,399.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,992.75 : 8,399.38 = 8,399.38 : x
2. Step 2: Convert to fraction form
   3,992.75/8,399.38 = 8,399.38/x
3. Step 3: Cross multiply
   3,992.75x = 8,399.38 × 8,399.38
4. Step 4: Simplify right side
   3,992.75x = 70,549,500.39
5. Step 5: Solve for x
   x = 70,549,500.39/3,992.75
6. Step 6: Final answer
   x = 17,669.40