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[tex]\\ \bull\tt\longmapsto 100x=60(1200)[/tex]
[tex]\\ \bull\tt\longmapsto 100x=72000[/tex]
[tex]\\ \bull\tt\longmapsto x=\dfrac{72000}{100}[/tex]
[tex]\\ \bull\tt\longmapsto x=720[/tex]
Answer:
Let x represent the number of shares Jillian owns
[tex]60\% = \frac{60}{100} \\ \frac{60}{100} = \frac{x}{1200} \\ 100x = (60)(1200) \\ 100x = 72000 \\ x = \frac{72000}{100} \\ \boxed{x = 720}[/tex]