Given - 
The sum of three numbers = 102
To Find - 
Numbers =?
Step-by-Step Explanation - 
Let second number = x
So, 
according to the question,
First number = 6+ x
Third Number = 4x
Now, 
The sum of three numbers = 102
So. 
6 + x + x + 4x = 102
6 + 6x = 102
(x+ 1) = 102/6
x+ 1 = 17
x = 16
So, 
First number = 6+ x = 6 + 16 = 22
Second Number = 16
Third Number = 4x = 4(16) = 64
Final Answer - 
First number = 22
Second Number = 16
Third Number = 64