Your answer is correct.
I think I got this one:
The negative for an image is 3.6 cm wide x 2.4 cm high. If a print with a width of 13.68 cm is produced from a negative, what will the size of the print be written as width x height? Solve using a proportion. Round the answer to the nearest hundredth.
My proportion:
3.6cm 13.68cm
------- = ----------
2.4cm X
3.6cm * X 13.68cm * 2.4cm
----------- = --------------------
3.6cm 3.6cm
X = 9.12cm
My answer - 13.68 cm x 9.12 cm
Thanks in advance.