What is the correct way to write three hundred nine million, fifty-eight thousand, three hundred four?

-- sitting erect, shoulders back, chest out, head up, spine straight

-- pen held loosely and comfortably in your hand

-- forearm resting lightly on the table

-- digit characters formed neatly and clearly, with uniform size and slant

                3 0 9, 0 5 8, 3 0 4 .