Finding the Third Proportional to 291,064 and 636,238

Step by Step Solution

1. Step 1: Write the proportion equation
   291,064 : 636,238 = 636,238 : x
2. Step 2: Convert to fraction form
   291,064/636,238 = 636,238/x
3. Step 3: Cross multiply
   291,064x = 636,238 × 636,238
4. Step 4: Simplify right side
   291,064x = 404,798,792,644
5. Step 5: Solve for x
   x = 404,798,792,644/291,064
6. Step 6: Final answer
   x = 1,390,755.27