Finding the Third Proportional to 636.69 and 1,367.88

Step by Step Solution

1. Step 1: Write the proportion equation
   636.69 : 1,367.88 = 1,367.88 : x
2. Step 2: Convert to fraction form
   636.69/1,367.88 = 1,367.88/x
3. Step 3: Cross multiply
   636.69x = 1,367.88 × 1,367.88
4. Step 4: Simplify right side
   636.69x = 1,871,082.02
5. Step 5: Solve for x
   x = 1,871,082.02/636.69
6. Step 6: Final answer
   x = 2,938.78