'Excel formatting - Integers with decimal point and thousand separator

All the data that come from the source are integers:

345819404
1093
28495

The only "tool" I have at my hand is Excel-style formatting options to turn it into:

3,458,194.04
10.93
284.95

Basically I can't convert those using / 100. So far I have two different styles that give me both components but I can't merge them together.

#,##0 gives me thousand separator

#"."00 places the dot as a "fake" decimal point

How can I get this work together?

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