Answer: Our required mixed number is 
Step-by-step explanation:
Since we have given that

We need to rewrite it in a mixed number.
Since x = 3.7777777..........--------(1)
Multiplying by 10 on both the sides, we get that
10x=37.777777.............-------------(2)
Now, subtract (2) - (1), we get that

So, we need to write in mixed number that is given by

Hence, our required mixed number is 