Okay, so here what you have to do is multiply 36 by 1/3 until you get to the fourth turn.
First term: 36
Second term: 36/1 * 1/3 = 12
Third term: 12/1 * 1/3 = 4
Fourth term: 4/1 * 1/3 = 1.333
The fourth term is 1.333
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