86419 ÷ 5 = 17283 R4
Alright, let's work through the division of 86419 by 5 step by step.

Step 1:
5 goes into 8 1 times with a remainder of 3.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 5 from 8 to get 3.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 5

Step 2:
5 goes into 36 7 times with a remainder of 1.
Write down 7 as next digit of of the result. 
Result so far: 17
Subtract 35 from 36 to get 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 5

Step 3:
5 goes into 14 2 times with a remainder of 4.
Write down 2 as next digit of of the result. 
Result so far: 172
Subtract 10 from 14 to get 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 5

Step 4:
5 goes into 41 8 times with a remainder of 1.
Write down 8 as next digit of of the result. 
Result so far: 1728
Subtract 40 from 41 to get 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 5

Step 5:
5 goes into 19 3 times with a remainder of 4.
Write down 3 as next digit of of the result. 
Result so far: 17283
Subtract 15 from 19 to get 4.

The final result is 17283 with a remainder of 4.