I have

price1, price2, price3, price4

They must be filled by the user in growing sequence as in the example below:

5.00, 7.00,8.50,10.00

or

1.00, 100.00,1000.00,5000.00

etc

It must be wrong if any variable is not according to the rule, as below:

4.50, 7.00,3.00,10.00

The message ("price 3 is incorrect") must be shown

Seems simple task, but I tried using < and > and could not
achieve a satisfatory result

Moises