CREATE TABLE table_7744 ("Province" TEXT, "Capital" TEXT, "Area  ( km\\u00b2 ) " FLOAT, "Population census 1999" FLOAT, "Population per km\\u00b2  ( 2009 ) " FLOAT, "Population census 2009" FLOAT)

What is the lowest Population per km (2009) that has a Solomon Islands province, with an Area (km ) smaller than 28,400?
SELECT MIN("Population per km\u00b2 (2009)") FROM table_7744 WHERE "Province" = 'solomon islands' AND "Area (km\u00b2)" < '28,400'
SELECT MIN("Population per km\u00b2 (2009)") FROM "table_7744" WHERE "Area (km\u00b2)" < '28,400' AND "Province" = 'solomon islands'