\(\dfrac{1919}{2323}\times\dfrac{464646}{747474}\times\dfrac{37}{19}\)
\(=\)\(\dfrac{1919:101}{2323:101}\times\dfrac{464646:10101}{747474:10101}\times\dfrac{37}{19}\)
\(=\dfrac{19}{23}\times\dfrac{46}{74}\times\dfrac{37}{19}\)
\(=\dfrac{19\times23\times2\times37}{23\times2\times37\times19}=1\)