To convert a temperature from degrees Celsius to degrees Fahrenheit, you can use the following formula:

°F = (°C × 9/5) + 32

Substituting the given temperature of 43.9°C into the formula, we get:

°F = (43.9°C × 9/5) + 32

°F = (39.51°C × 1.8) + 32

°F = 71.12°F + 32

°F = 103.12°F

Therefore, 43.9°C is equal to 103.12°F.