Finding the Third Proportional to 3,951.28 and 4,315.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,951.28 : 4,315.78 = 4,315.78 : x
2. Step 2: Convert to fraction form
   3,951.28/4,315.78 = 4,315.78/x
3. Step 3: Cross multiply
   3,951.28x = 4,315.78 × 4,315.78
4. Step 4: Simplify right side
   3,951.28x = 18,625,967.80
5. Step 5: Solve for x
   x = 18,625,967.80/3,951.28
6. Step 6: Final answer
   x = 4,713.91