The binary equivalent of 1236 is : 0000 0100 1101 0100

$$(1236)_{10}=(0000~0100~1101~0100)_2$$

To convert the decimal number 1236 to binary, we can repeatedly divide by 2 and keep track of the remainders. Here’s the process:

1. 1236 ÷ 2 = 618, remainder 0
2. 618 ÷ 2 = 309, remainder 0
3. 309 ÷ 2 = 154, remainder 1
4. 154 ÷ 2 = 77, remainder 0
5. 77 ÷ 2 = 38, remainder 1
6. 38 ÷ 2 = 19, remainder 0
7. 19 ÷ 2 = 9, remainder 1
8. 9 ÷ 2 = 4, remainder 1
9. 4 ÷ 2 = 2, remainder 0
10. 2 ÷ 2 = 1, remainder 0
11. 1 ÷ 2 = 0, remainder 1

Now, reading the remainders from the bottom up, we get:

$$(1236)_{10} = (0000~0100~1101~0100)_2$$

So, the binary equivalent of 1236 is : 0000 0100 1101 0100.