If you don't want to type out all the 10^ stuff, you could just use the scientific notation 'E' ([2nd][,](EE). That will function as 'times ten to the power of'.
This is just a matter of typing things in correctly... I just did it with my calculator and it comes up with .011349047. There isn't really a "step-by-step" way to punch in numbers...
2.851E12 * 3.01E-3 * E-3² * 1.15E-3²
Please note that in "E-3", the "-" is the negative symbol [(-)], not the minus symbol [−]. And as previously mentioned, the 'E' can be accessed through [2nd][,](EE).