Your question is not clear.
Which is your slave site definition.
Which is the domain you have defined in your slave site ? Is it
192.168.247.137/joomla/multisites/joomla3
In this case, did you deployed the slave site into the {site_dir} if you have defined the slave site "joomla3" ?
The 404 answer is page not found.
So check the domain deployment and your URL.
They must be identical.
You can also use the "hello world" procedure describe in tutorial video 7 to try deploy the "hello.php" into the directory "....../joomla/multisites/joomla3" where you expect to have the slave site runing.