I need to set up port forwarding from my local Windows machine Port 3307 to a remote MySQL server port 3306 but accessed via 2 Linux proxy servers and a Linux web server.
I need to use Putty or plink.exe on the Windows machine to set up the connnection.
See diagram 
I've found examples using Putty GUI or plink CLI to achieve similar with only 1 proxy server but not with multiple hops.
I can achieve the connection I need on a *nix machine using
ssh -N -L 127.0.0.1:3307:db-server:3306 -J user@proxy1 user@proxy2 user@web-server
Trying to do the same using Putty or plink.
Update
I ended up using OpenSSH on Windows.
The final command was a little different to above.
ssh -L 127.0.0.1:3307:db-server:3306 -J user@proxy1,user@proxy2 user@web-server -p 31001 -i "C:\path\to\private-key"
Note we were connecting to the final web server on port 31001, hence the -p 31001.