A 55-year-old male presents to the emergency department with complaints of fever, productive cough with yellowish-green sputum, chest pain, and shortness of breath for the past three days. He reports a history of smoking for 30 years. On examination, his temperature is 39°C (102.2°F), respiratory rate is 28 breaths per minute, blood pressure is 140/90 mmHg, and oxygen saturation is 92% on room air. Auscultation reveals crackles in the right lower lung field. Laboratory tests show elevated white blood cell count.