Finding the Third Proportional to 628,128 and 1,380,672

Step by Step Solution

1. Step 1: Write the proportion equation
   628,128 : 1,380,672 = 1,380,672 : x
2. Step 2: Convert to fraction form
   628,128/1,380,672 = 1,380,672/x
3. Step 3: Cross multiply
   628,128x = 1,380,672 × 1,380,672
4. Step 4: Simplify right side
   628,128x = 1,906,255,171,584
5. Step 5: Solve for x
   x = 1,906,255,171,584/628,128
6. Step 6: Final answer
   x = 3,034,819.61