2 is the number that should be added to each of the number 5,11,19,37 , so that they are in propotion.

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Step-by-step explanation:

5+x/11+x=19+x/39+x

applied componento and div.

5+x+11+x/5+x-11-x=19+x+39+x/19+x-39-x

16+2x/-6=58+2x/-20

solving

x=1