Much of the world uses . and , in the opposite way we do in the US. So the dollar store here would have 1.00 prices here, but 1,00 elsewhere. Rp 4.500.000 is 4.5 million rupees, which is currently about $54,865.00.
4.5 million rupiah is USD300
You're right about the commas, however, Indonesia uses the Rupiah, which sounds very similar to the Rupee used in India.
Just to clarify, 4500000 rupiah is approximately equivalent to 300 USD.