Finding the Third Proportional to 3,128.25 and 4,399.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.25 : 4,399.50 = 4,399.50 : x
2. Step 2: Convert to fraction form
   3,128.25/4,399.50 = 4,399.50/x
3. Step 3: Cross multiply
   3,128.25x = 4,399.50 × 4,399.50
4. Step 4: Simplify right side
   3,128.25x = 19,355,600.25
5. Step 5: Solve for x
   x = 19,355,600.25/3,128.25
6. Step 6: Final answer
   x = 6,187.36