Finding the Third Proportional to 427,320 and 664,290

Step by Step Solution

1. Step 1: Write the proportion equation
   427,320 : 664,290 = 664,290 : x
2. Step 2: Convert to fraction form
   427,320/664,290 = 664,290/x
3. Step 3: Cross multiply
   427,320x = 664,290 × 664,290
4. Step 4: Simplify right side
   427,320x = 441,281,204,100
5. Step 5: Solve for x
   x = 441,281,204,100/427,320
6. Step 6: Final answer
   x = 1,032,671.54