Unable to Start PostgreSQL. kernel's SHMMAX parameter exceeded you limit
This page in the manual has detailed instructions how to deal with SHMMAX and SHMALL. It depends on your OS.

For Linux (example from the manual, to allow 16 GB):

$ sysctl -w kernel.shmmax=17179869184
$ sysctl -w kernel.shmall=4194304


Your number is very high: 52033798400 translates to 48 GB. Do you have that much RAM available?

Also, more quotes:


  Note that SHMALL is measured in pages rather than bytes on many systems.


And:


  A page is almost always 4096 bytes except in unusual kernel configurations with "huge pages" (use getconf PAGE_SIZE to verify).


Bold emphasis mine. You applied a factor 10000 instead. The matching setting for SHMALL would be 12703564 instead of 5203379.

In addition edit the settings in /etc/sysctl.conf to persist the settings for a server restart.
Note that changing this file alone does not affect the running system.