Finding the Third Proportional to 628.78 and 1,358.72

Step by Step Solution

1. Step 1: Write the proportion equation
   628.78 : 1,358.72 = 1,358.72 : x
2. Step 2: Convert to fraction form
   628.78/1,358.72 = 1,358.72/x
3. Step 3: Cross multiply
   628.78x = 1,358.72 × 1,358.72
4. Step 4: Simplify right side
   628.78x = 1,846,116.64
5. Step 5: Solve for x
   x = 1,846,116.64/628.78
6. Step 6: Final answer
   x = 2,936.02