Answer:
The answer is 3.8
Explanation:
Change the divisor 3.4 to a whole number by moving the decimal point 1 places to the right. Then move the decimal point in the dividend the same, 1 places to the right. 
 
We then have the equations: 
129.2 ÷ 34 = 3.800000 
and therefore: 
12.92 ÷ 3.4 = 3.800000 
Both calculated to 6 decimal places.
( In 3.800000, you can take away the zeros, which will be equal to 3.8 )
I hope this was helpful! :)