Finding the Third Proportional to 291,122 and 636,380

Step by Step Solution

1. Step 1: Write the proportion equation
   291,122 : 636,380 = 636,380 : x
2. Step 2: Convert to fraction form
   291,122/636,380 = 636,380/x
3. Step 3: Cross multiply
   291,122x = 636,380 × 636,380
4. Step 4: Simplify right side
   291,122x = 404,979,504,400
5. Step 5: Solve for x
   x = 404,979,504,400/291,122
6. Step 6: Final answer
   x = 1,391,098.94