Setting WAN

Hi all,

I have a case, I have a public IP address, where the public IP has a different IP address that can access the portal, here is an example:
ip address: ip public 10.xxx.xxx.202 /30, GW 10.xxx.xxx.201
ip web portal 172.xxx.xxx.52 / 32

and my ip lan is 192.xxx.xxxx.xxx/24

I have tried it directly on the laptop using ip addres 10.xxx.xxx.202 and  running the web portal, the results can be accessed, then I set it on Fortigate 300c to be able to access on the LAN network,
 but it can't, I have settings : ip interface, Static Route, and firewall NAT policy settings but at the time for the access running ping GW 10.xxx.xxx.201 and ping web portal 172.xxx.xxx.52 on LAN RTO

my question is:
1. How do settings firewall fortiget 300c  to access ip portal 172.xxx.xxx.xxx/32 that can access on the LAN network