First of all you would have to convert 2 and five-twelfths to an improper fraction by multiplying 2 times 12 and then adding 5 to this, putting the whole thing over 12.
2x12=24
24+5=29
29/12
You now have 29/12 , 12/5 , 43/18
You would then want to convert these to decimals, unless you want to find common denominators.
29/12= 2.41666
12/5=2.4
43/18=2.38888
You can now see the correct order from least to greatest: 43/18 , 12/5 , 29/12