Finding the Third Proportional to 2,399.63 and 3,918.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.63 : 3,918.38 = 3,918.38 : x
2. Step 2: Convert to fraction form
   2,399.63/3,918.38 = 3,918.38/x
3. Step 3: Cross multiply
   2,399.63x = 3,918.38 × 3,918.38
4. Step 4: Simplify right side
   2,399.63x = 15,353,662.64
5. Step 5: Solve for x
   x = 15,353,662.64/2,399.63
6. Step 6: Final answer
   x = 6,398.36