How to Replace comma in double quotes Using PowerShell

I have CSV file which has following line
111,222," 1,876,890"

I would like to have output as follows

How can I do this in Power Shell?
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If the csv file has a header line:
$Col = '<Name of Column 3>'
Import-Csv -Path C:\Temp\input.csv |
	ForEach-Object {$_.$Col = $_.$Col.Replace(',', '').Trim(); $_} |
	ConvertTo-Csv -NoTypeInformation |
	ForEach-Object {$_.Replace('"', '')} |
	Set-Content -Path C:\Temp\output.csv

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If it does not have a header line:
Import-Csv -Path C:\Temp\input.csv -Header Col1, Col2, Col3 |
	ForEach-Object {$_.Col3 = $_.Col3.Replace(',', '').Trim(); $_} |
	ConvertTo-Csv -NoTypeInformation |
	Select-Object -Skip 1 |
	ForEach-Object {$_.Replace('"', '')} |
	Set-Content -Path C:\Temp\output.csv

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You can cast the field as a number, rather than doing any string operations.
PS C:\Users\Mark> [int]" 1,876,890"

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