Making the denominator same i.e L.C.M 60 to compare the numbers we get,
812=4060=0.6734=4560=0.7545=4860=0.80
The largest decimal number among the three is 0.80 and the corresponding fraction is 45.
After this, 0.75 is the second largest decimal number corresponds to 34 and 0.67 is the smallest decimal number corresponds to 812.
Therefore. descending order is: 45 > 34 > 812.