Study the given pattern carefully and select the number that can replace the question mark [?] in it.
First row: 5, 4, 109
Second row: 8, 7, 463
Third row: 6, 9, [?]
(NOTE: Operations should be performed on the whole numbers, without breaking down the number into its constituent digits. For example, 13 - Operations on 13 such as adding/deleting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)