Australia is about 86,014 times bigger than Fort Lauderdale.

Fort Lauderdale (excluding the city's 9.9 sq km of water area) is approximately 90 sq km, while Australia is approximately 7,741,220 sq km, making Australia 8,601,256% larger than Fort Lauderdale.
Tip: This to-scale comparison of Fort Lauderdale vs. Australia uses the Mercator projection, which distorts the size of regions near the poles.