To convert pints to milliliters, we can use the conversions you provided.
1 pint = 2 cups and 1 quart = 2 pints = 946.35 mL
Thus, we can figure out how many milliliters are in 1 pint:
1 pint = 1/2 quart = 1/2 * 946.35 mL = 473.175 mL
Now, to find out how many milliliters are in 3 pints:
3 pints = 3 * 473.175 mL = 1419.525 mL
When rounding to the nearest tenth, this is:
1419.5 mL
Therefore, the answer is 1419.5 mL.