Finding the Third Proportional to 291,105 and 636,336

Step by Step Solution

1. Step 1: Write the proportion equation
   291,105 : 636,336 = 636,336 : x
2. Step 2: Convert to fraction form
   291,105/636,336 = 636,336/x
3. Step 3: Cross multiply
   291,105x = 636,336 × 636,336
4. Step 4: Simplify right side
   291,105x = 404,923,504,896
5. Step 5: Solve for x
   x = 404,923,504,896/291,105
6. Step 6: Final answer
   x = 1,390,987.80