Here are the steps in dividing the given decimal.
1. Convert the divisor 0.004 into a non-decimal value by multiplying it by 1000.

In the same way, multiply the dividend 0.86 by 1000 as well.

2. The division now becomes 860 divided by 4. Let's now divide the numbers using short division.
Hence, the quotient of 860 by 4 is 215.
Therefore, 0.86 divided by 0.004 is 215.