<image>Use different rectangles to frame any 4 numbers on a calendar card (as shown). Carefully observe the characteristics of the numbers framed each time, and then answer the following questions.
(1) If a vertical rectangle (such as "6, 13, 20, 27" shown in the image) is used and the second number from the top is represented by "X", then the fourth number is ____.
(2) If a square-shaped (田字形) rectangle (such as "15, 16, 22, 23" shown in the image) is used and the sum of the four numbers is 84, the largest of these four numbers is ____.