It is not possible to answer this since the divisor is unknown.
4.2
122.2381
21 will go into 4 four times and the big number which is six will go on the other side and that fraction is 7/8
21.2647
64.2
The remainder divided by the divisor is the fraction. For example 12 divided by 7 is 1 with remainder of 5; the remainder fraction is 5/7 so answer is 1 and 5/7
10/21
0.2381
4.2
122.2381
4.2
21 will go into 4 four times and the big number which is six will go on the other side and that fraction is 7/8
5
14, remainder 5
21.2647
64.2
21.25