Finding the Third Proportional to 3,900 and 5,059.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,900 : 5,059.50 = 5,059.50 : x
2. Step 2: Convert to fraction form
   3,900/5,059.50 = 5,059.50/x
3. Step 3: Cross multiply
   3,900x = 5,059.50 × 5,059.50
4. Step 4: Simplify right side
   3,900x = 25,598,540.25
5. Step 5: Solve for x
   x = 25,598,540.25/3,900
6. Step 6: Final answer
   x = 6,563.73