These list the following numbers in order from least at the top to greatest at the bottom.

To compare the numbers in the list, we will convert them to their decimal forms:

1. **1.2 x 10^-2** = 0.012
2. **1.6 x 10^7** = 16,000,000
3. **3.2 x 10^-5** = 0.000032
4. **4.8 x 10^3** = 4,800

Now, we can list these numbers in order from least to greatest:

1. **3.2 x 10^-5** (0.000032)
2. **1.2 x 10^-2** (0.012)
3. **4.8 x 10^3** (4,800)
4. **1.6 x 10^7** (16,000,000)

So the ordered list is:

1. 3.2 x 10^-5
2. 1.2 x 10^-2
3. 4.8 x 10^3
4. 1.6 x 10^7