#### Answer

1.9, $\sqrt 3$, $\frac{5}{4}$, -1.2

#### Work Step by Step

We convert all the numbers to decimals to make them easier to compare:
$1.9=1.9$
$\frac{5}{4}=1.25$
$-1.2=-1.2$
$\sqrt 3 \approx 1.73$.
We can see that 1.9 is the greatest, followed by 1.73, 1.25, and -1.2.