It depends on what exercises you do for each workout. For example, when you do chest do you do many variations of the same exercise?
A push/pull split could work in your favour. You wouldn't have to change any exercises and it could look like this:
Sunday: Push
Monday: Pull
Tuesday: Cardio
Wednesday: Push
Thursday: Pull
Friday: Cardio
Push exercises would be anything where a joint extends (i.e. bench press, shoulder press, squats) and pull exercises the opposite (i.e. lat pulldown, rows etc).
That way you would get 2 workouts per week for each muscle group and the 2 days cardio.