user: Question: What is the 2007 estimate when the rank (csa) is 4
Columns: ['Rank (CSA)', 'Combined Statistical Area (or Metropolitan Statistical Area if noted)', 'State(s)', '2007 Estimate', '2000 Population', 'Percent Change (1990–2000)']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['4', 'Dallas-Fort Worth', 'TX', '0 6,498,410', '0 5,487,956', 'A011 +18.41%']
SQL:

assistant: SELECT "2007 Estimate" FROM "Table" WHERE "Rank (CSA)" = '4';