This is the 6401st most frequent Russian word.
четвертым
"Четвёртым" means "as the fourth" or "in the fourth position" in English.
"Четвёртым" acts as an ordinal numeral, denoting the position (fourth) in a sequence.
Это было моё четвёртым успешным проектом.
This was my fourth successful project.
"Четвёртым" is used in the instrumental case to describe a characteristic or role.
Он просил назначить его четвёртым докладчиком.
He asked to be appointed as the fourth speaker.
"Четвёртым" is used to describe the sequence of arrival, emphasizing the order.