Finding the Third Proportional to 636.05 and 1,380.89

Step by Step Solution

1. Step 1: Write the proportion equation
   636.05 : 1,380.89 = 1,380.89 : x
2. Step 2: Convert to fraction form
   636.05/1,380.89 = 1,380.89/x
3. Step 3: Cross multiply
   636.05x = 1,380.89 × 1,380.89
4. Step 4: Simplify right side
   636.05x = 1,906,859.42
5. Step 5: Solve for x
   x = 1,906,859.42/636.05
6. Step 6: Final answer
   x = 2,997.97