Answer:
38
Step-by-step explanation:
Sequential pairs will be ...
38 - 87
79 - 96
17 - 74 or 79
43 - 38
74 - 43
96 - (none)
87 - 74 or 79
We notice that 17 has no preceding number. It must be first in the list. 79 cannot be second, because that skips a bunch of numbers. The sequence appears to be ...
17 - 74 - 43 - 38 - 87 - 79 - 96
The 4th number in the list is 38.
