Just wondering, how much is a cubic meter of gold worth in American dollars?

Gold is measured in weight, not size. Currently, 1 oz of gold is worth $1070, according to http://goldprice.org/gold-price.html For your question though, you'll have to convert meters to ounce or pounds.

That depends on the weight and purity of the gold. The current price for an ounce of 24 karat gold is $1072.70 which measures about 2 inches by 1 inch. A meter is roughly 39.4 inches in length. In dividing that by 2 for length and by 1 for width you will get the formula for square meter, in inches which is 19.5 by 39.4. When multiplying that to get square meters, it equals 768.3. Assuming that all calculation are correct, that's how many ounces it would take to make a square meter.

So if my math is right a square meter of 24 karat gold would cost $824,155.41 USD

A cubic meter of gold weighs around 45000 pounds or 720000 ounces at $1070 per ounce that's roughly $770,400,000