To find the midway, we shall first know the difference between the two given.
4400 - 3400 = 1000
1000 is the difference, we shall divide 1000 by 2 to find its half in order to know the midway.

= 500
500 is the half of 1000
now either add 500 to 3400 or subtract 500 from 4400, it will give us the same exact answer anyways.
3400 + 500 = 3900
4400 - 500 = 3900
so, 3900 is the number between 3400 and 4400