We land at Shanghai Hongqiao Airport from Beijing, at 10:50pm.

Hi, Nick. According to your situation, you are advised to take metro line 2 to Guanglan Road Station at first. The last train leaves at 23:20. Upon arrival, you need to take a taxi to PVG which usually costs around CNY130 at night.
If time is too tight for the last schedule, you may take a taxi to PVG directly. The taxi fare is around CNY290.