True windows process cpu utilization percentage using powershell

Recently I had to write a powershell script that grabbed the CPU percentage of a process running on one of our servers so we could trend it.  I figured this would be super simple task.  To my surprise this was quiet a challenge.  I tried several different approaches including get-process and get-wmiobject.  Most of the usual commands will return some value that’s either a process time, or a cpu percentage that’s not accurate unless you have a single core box.  After a little digging I figured it out, and since no one else out there has any really good example code I’m going to share with you my code:

#Define the process name
$ProcessName = "msiexec"
#Get the number of CPU cores
foreach ($proc in (Get-WmiObject  Win32_Processor)){if ($proc.numberofcores -eq $null){$cores++}else{$cores = $cores + $proc.numberofcores}}
#Get the process's perfmon counter for %Processor Time, divide by number of cores, and round to two decimal places 
[Math]::round(((((Get-Counter "\Process($ProcessName)\% Processor Time").Countersamples)[0].CookedValue)/$cores),2)