German chemist Fritz Haber proposed paying off the reparations imposed against Germany after World War I by extracting gold from seawater. Given that

(1) The amount of the reparations was $28.8 billion dollars,

(2) The value of gold at the time was about $21.25 per troy ounce (1 troy ounce = 31.103 g), and 

(3) Gold occurs in seawater to the extent of per ton of 4.67 x 10¹⁷ atoms per ton of (1 ton = 2000 lb), seawater how many cubic kilometers of seawater would have had to be processed to obtain the required amount of gold? Assume that the density of seawater is 1.03 g/cm³.