Nayelly is weighing how much of a solid resulted from a chemical reaction on a scale that reads to the nearest 18 ounce. The measurement of the solid is 678 ounces. If the answer calls for the measurement to be rounded to the nearest tenth of an ounce, Nayelly should report that the solid weighed __________ ounces. Enter your answer as the decimal number that correctly fills in the blank in the previous sentence, like this: 42.6