47 is a prime, so its only factors are 1 and 47. Prime numbers don't have "proper" factors.
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The proper factors of 220 are 2,4,5,10,11,20,22,44,55,110
The factors of 94 are 1, 2, 47, and 94
1, 5, 7, and 35 are the factors of 35. The proper factors are 5 and 7.
Since the numbers 47 and 174 share no positive integer factors other than 1, the proper fraction 47/174 is already expressed in its simplest form.
The number 47 has only two factors, which are 1 and 47.