Finding the Third Proportional to 3,960.50 and 8,404.75

Step by Step Solution

1. Step 1: Write the proportion equation
   3,960.50 : 8,404.75 = 8,404.75 : x
2. Step 2: Convert to fraction form
   3,960.50/8,404.75 = 8,404.75/x
3. Step 3: Cross multiply
   3,960.50x = 8,404.75 × 8,404.75
4. Step 4: Simplify right side
   3,960.50x = 70,639,822.56
5. Step 5: Solve for x
   x = 70,639,822.56/3,960.50
6. Step 6: Final answer
   x = 17,836.09