Emperical Formulas - Chemistry Quiz?

london

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What is the empirical formula of thiophene?
The organic solvent thiophene is a carbon-hydrogen-sulfur compound that yields CO2, H2O, and SO2 on complete combustion. When subjected to combustion analysis, a 1.3020 g sample of thiophene produces 2.7224 g CO2, 0.5575 g H2O, and 0.9915 g SO2. What is the empirical formula of thiophene?

My friend explained this to me, and said the answer is C4H4S, but why? I don't understand. Can someone work this step by step?
 
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