1. The problem asks to convert 3.86 feet into inches. 2. We use the conversion formula: $$1 \text{ foot} = 12 \text{ inches}$$. 3. To convert feet to inches, multiply the number of feet by 12. 4. Calculate: $$3.86 \times 12 = 46.32$$. 5. Therefore, 3.86 feet equals 46.32 inches.