We are given
The diameter of a specific hydraulic cylinder shaft is 2.1634 inches
so,

the diameter of another shaft is 3.0187inches
so,

now, we can find the difference
the difference in the diameter=(the diameter of another shaft)-(The diameter of a specific hydraulic cylinder shaft)
now, we can plug values
the difference in the diameter is

we can plug values

the difference in the diameter is 0.8553 inches..........Answer