Finding the Third Proportional to 296,644 and 636,488

Step by Step Solution

1. Step 1: Write the proportion equation
   296,644 : 636,488 = 636,488 : x
2. Step 2: Convert to fraction form
   296,644/636,488 = 636,488/x
3. Step 3: Cross multiply
   296,644x = 636,488 × 636,488
4. Step 4: Simplify right side
   296,644x = 405,116,974,144
5. Step 5: Solve for x
   x = 405,116,974,144/296,644
6. Step 6: Final answer
   x = 1,365,667.18