We need to put all the numbers in same decimal places after decimal point (greatest places, one)
0.034 has 3 decimal places, so we make all of them 3 decimal places. Hence:
4.300
0.430
0.034
4.030
Now, have a look at the numbers.
Greatest 4.300, or 4.3
Then, 4.030, or 4.03
Then 0.430, or 0.43
Least 0.034
Greatest to Least ---- 4.3, 4.03, 0.43, 0.034