79.41% is the percentage that corresponds to the fraction 54/68.
The fraction 54/68 can be simplified to 27/34, which is still a little more than three‑quarters of a whole. In everyday terms, it means that out of every 100 parts, about 79 of them are covered by the fraction.
When you see this number in reports or charts, it tells you that the portion represented by 54 out of 68 is roughly 79.41 percent of the total. This makes it easy to compare with other percentages or to understand the size of the share in a familiar way.