how to combine two files into one file using shell scrip

eg.
file 1 has:

4  0 8628380 653253   0   0   0   0    0   0 
 2  0 8626407 655222   0   0   0   0    0   0 
 4  0 8633729 647892   0   0   0   0    0   0 
 5  0 8646253 635367   0   0   0   0    0   0 

file 2 has:

4798 48717 11554 
5408 56487 14359 
6010 58415 15220 
5541 41044 12675 

I want to make a file 3 like: ( appending each line of file2 in file1 )

4  0 8628380 653253   0   0   0   0    0   0 4798 48717 11554 
 2  0 8626407 655222   0   0   0   0    0   0 5408 56487 14359 
 4  0 8633729 647892   0   0   0   0    0   0 6010 58415 15220 
 5  0 8646253 635367   0   0   0   0    0   0 5541 41044 12675 

any advice will be highly appreciated.

thanks~

paste file1 file2

looks good, Thanks Cabrao~