It is 12.66.
That is according to the IEEE standard 754 which is designed to prevent the introduction if systematic bias by rounding 5 to evens.
However, most schools ignorantly teach that 5 should always be round up and so, the answer expected is probably 12.67.
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12.655 cm rounded to four significant figures is 12.66cm
241.9956 rounded to four significant figures is 242.0
The answer is 0.059 as the four significant figures are 0,0,5,9.
111.009 mm rounded off to four significant figures is 111.0
To 4 sig fig: 1.246 x 108