My Raspberry Pi gives a resolution of 1824x984 while my display does not support it. I cannot change the resolution in display settings. I changed settings to 1360x768 (no 39) in config.txt but it is still providing 1820x768 or something like this. I am using a HDMI to VGA adapter.

Do you see black borders around the image? If so, overscan is enabled and will affect the resolution. Search for DISABLE_OVERSCAN=0 in /boot/config.txt and set this to 1. Uncomment the # if necessary.