add a dj boot monitor

hello,

i recently purchased one active monitor speaker (placed close to me) so i can hear better how the music sounds on the dancefloor.
i have two active behringer speakers on my hercules dj rmx (using jacks to connect them) but i cannot find a way how i can connect this monitor speaker (from my controller) together with these 2 behringer speakers? 
anyone who could help me with this issue?

There are plenty of options:

- You can use the RCA outputs of the Rmx at the same time as the jack to connect the monitor;

- some speakers provide an "output", allowing the connection of multiple speakers in series. If this is the case with the Behringer (what is the specific model?), you could simply connect the monitor to this output.