Returns the fourth value of a series.
fourth series
series - The series argument. (must be: series date port tuple event)
An error will occur if no value is found. Use the PICK function to avoid this error.
print fourth "REBOL" O
print fourth [11 22 33 44 55 66] 44
print fourth 199.4.80.1 1
fifth - Returns the fifth value of a series.
first - Returns the first value of a series.
pick - Returns the value at the specified position in a series.
second - Returns the second value of a series.
third - Returns the third value of a series.