Finding the Third Proportional to 3,900.66 and 5,086.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,900.66 : 5,086.55 = 5,086.55 : x
2. Step 2: Convert to fraction form
   3,900.66/5,086.55 = 5,086.55/x
3. Step 3: Cross multiply
   3,900.66x = 5,086.55 × 5,086.55
4. Step 4: Simplify right side
   3,900.66x = 25,872,959.11
5. Step 5: Solve for x
   x = 25,872,959.11/3,900.66
6. Step 6: Final answer
   x = 6,632.98