The success of others is truly your own success, for others who are successful would not be present within your reality if you were not up to speed with the vibration of success yourself.
Therefore, whenever you happen to see someone who is successful, you are seeing that successful person in your life due to your activating of a vibration within yourself that matches the same level of success the other person has achieved.
If you want to manifest the same level of success in your own life, you simply have to activate that vibration more of the time, as does the successful person you are observing.