Write 543.26 as a sum of decreasing powers of 8.
This gives Dec(543.26) = OCT(1037.205 075 341 217 27)
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(83)base10 to octal
In binary this number is equivalent to 11111000011 while in octal it is 3703
Convert the top (numerator) to decimal, and then convert the denominator to decimal. Octal fraction 15/26 is decimal (8+5) divided by decimal (16+6) = 13/22 decimal.
You can use the Windows calculator to do the conversions. If you want to learn how to do it yourself:To convert binary to decimal, multiply the right-most digit with 1, the second digit (from the right) with 2, the third with 4, etc.To convert to octal, group the bits from the right to the left, in groups of 3. Convert each group to a decimal digit.
Starting from the right hand end, take the digits in groups of 3 and convert each group to its octal equivalent (which for this task will always be the same as decimal). eg 110 is octal 6