What is the fourth message written on kryptos?
kryptos is an encrypted sculpture located on the grounds of the central intelligence agency (cia) in langley, virginia. this sculpture was dedicated in november 1990, with at least four encrypted messages. after over two decades, no solution to the fourth message is publicly known.

Hey there!

If you're just looking for a transcript, this is the 4th section of the Kryptos code:

"OBKR


"

...OBKR continues from the last line of the third section. 

As your excerpt states, the code remains unsolved to this day, so I couldn't tell you what it actually means. There are many proposed metaphorical solutions to the code, but none are universally recognized as the answer. You could do a search to see if there are any proposed solutions that you find plausible if you're curious. 

Hope this helped you out! :-)