Absolutely! Here's how to convert milliliters (ml) to fluid ounces (oz):
**Key conversion factor:**
* 1 milliliter (ml) = 0.033814 fluid ounces (oz)
**Steps:**
1. **Set up a proportion:**
Since we know the conversion factor, we can set up a proportion:
```
1 ml / 0.033814 oz = 420 ml / x oz
```
(where 'x' represents the unknown quantity of fluid ounces)
2. **Cross multiply:**
Multiply across the proportion:
```
1 ml * x oz = 420 ml * 0.033814 oz
```
3. **Isolate 'x':**
Divide both sides of the equation by 1 ml:
```
x oz = (420 ml * 0.033814 oz) / 1 ml
```
4. **Calculate:**
Perform the calculation:
```
x oz ≈ 14.20 oz
```
**Therefore, 420ml is approximately equal to 14.20 fluid ounces.**