Wow, this one made me really think! I am not familiar with spatial tools, so this was a great way to learn them.
I had the same solution as the provided one. The only difference for me was I did not use a double for my formula calculation so my decimals differed slightly. This was a fun challenge, and having never used the alteryx spatial tools it was crazy to see the time saving ability of some of the tools versus using a traditional spatial program.