Finding the Third Proportional to 639.25 and 1,025.38

Step by Step Solution

1. Step 1: Write the proportion equation
   639.25 : 1,025.38 = 1,025.38 : x
2. Step 2: Convert to fraction form
   639.25/1,025.38 = 1,025.38/x
3. Step 3: Cross multiply
   639.25x = 1,025.38 × 1,025.38
4. Step 4: Simplify right side
   639.25x = 1,051,393.89
5. Step 5: Solve for x
   x = 1,051,393.89/639.25
6. Step 6: Final answer
   x = 1,644.73