The easiest way to order this from least to greatest is to convert them all to decimals.
262% - need to move the decimal point 2 places to the left to convert to a decimal = 2.62
2 3/5 - need to convert fraction to a decimal - 3/5 = .6 + 2 = 2.6
In order from least to greatest is 2.6, 2.62, 26.2