you can't convert 1011.112 to hex. the reason is simple bcz to convert into hex, first you have to convert in the binary value which must be vary between 0 and 1 only. here you used 2 i;e 1011.112,...
Here is a converter: http://easycalculation.com/hex-converter.php I usually covert the Hex to decimal and then convert that to binary. If it helps, you can also use the standard 'calculator' provided...