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4.1.Let the fourth proportion be x
42:12::7:x
=>42/12=7/x
cross mulplication occurs
42x=7 multiply 12
42x=84
x=84/42
x=2
remaning 2 and 3 of 4 are of the same process
42:12::7:x
=>42/12=7/x
cross mulplication occurs
42x=7 multiply 12
42x=84
x=84/42
x=2
remaning 2 and 3 of 4 are of the same process
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