Get Column Value from Multiple Selection

I know how to get the index of rows that are selected using getSelectionProperty("values"). However is there any way to get a value in a column of multiple rows? For example say I have the following rows selected:

0 | Bob | 123 | 456
1 | Joe | 567 | 890

How can I snagged the values from the last column to get 456 & 890?

Thanks for the help!