Please help with mole fraction question!?

a mixture of ethanol and 1-propanol behaves ideally at 36 Celcius and is in equibrilium with its vapor. If the mole fraction of ethanol in the solution is 0.62, calculate its mole fraction in the vapor phase at this temperature. ( The vapor pressures of pure ethanol and 1-propanol at 36 Celcius are 108mmHg and 40.0 mmHg,respectively.)