A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 1215, exactly as in the question.
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Divide the percentage by 100: So 1215% = 12.15
√1215 = 34.856850116
0.1215 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is 1215/10000 which can be simplified. However simplification would mean that you could lose information about the precision of the fraction.
1215 = 12150/10
LCM of 1215 and24 is 9720.