Should I, as an amateur, get my result published based on a well known professor's opinion?
Assuming the following premises are true:


The professor you state is well-known and established in his field
You have produced a tangible result in this field
The professor endorses your result to be new


Then,  


  Get the result published!


I do not see any reason for this not to be published. Better yet, contact the professor for further directions (see comments).