Context : Stars pulsating in three radial modes are very rare , only three examples are known in the Galaxy .
These stars are very useful since their periods may be measured very precisely , and this will constrain the global stellar parameters and the models of the star ’ s interior .

Aims : The purpose of this paper is to present a new example of the class of triple-mode radial pulsators .

Methods : A search for candidate multi-mode pulsators was done in public survey data .
Time-series photometry of one of the candidates , GSC~762-110 , was performed .

Results : GSC 762-110 was found to be a triple-mode radial pulsator , with a fundamental period of 0.1945d and period ratios of 0.7641 and 0.8012 .
In addition two non-radial modes were found , for which the amplitude diminished considerably over the last few years .

Conclusions :