Ladder #219 is five finishes in a row: 18, 60, 62, 83 and 104. You get one turn of three darts for each, and every finish has to end on a double or the bull.
18 is a straight double: D9. A miss into the single leaves an odd number, so the next dart has to set up a double before you can finish. 60 is a two-dart finish: 20 D20.
62 is a two-dart finish: T18 D4. 83 is a two-dart finish: T17 D16. 104 is a two-dart finish: T18 Bull.
One route here finishes on the bull (T18 Bull for 104); it counts as a double.
At best the five finishes need 9 darts out of 15. Your result counts the finishes you make first and the darts you used second. These are friendly numbers. Aim at the inside half of the double on the first dart — a miss on that side lands in the single and keeps the finish alive.