Hi Del,
It sounds to me like a basic Open Left Turn -- step 17 in Silver American Cha Cha. (Note that for some reason, the B variation loads up first in the video window, so you'll need to click on the video thumbnail for the main figure to view it).
The main two differences between the pattern you described above and the Open Left Turn are (1) the leader on the inside of turn is closing is feet on count 3 instead of stepping sideways, which is a perfectly acceptable alternative -- as is the follower closing her feet on count 3 when she's on the inside of turn, and (2) you're taking your last chasse to the side instead of dancing a forward lock step outside partner on right. Also perfectly doable, if a little less common.
So in a nutshell, the closest figure to what you're describing is called the "Open Left Turn". And although it's not 100% identical (the last chasse being the main difference), I'd say it's close enough that if you called it by the same name, people would know basically what you're talking about.
Regards,
Jonathan