Here's how we get that:

1. Move the decimal point: Start with 43,100,000 and move the decimal point 7 places to the left until you have a number between 1 and 10 (which is 4.31).

2. Count the places: You moved the decimal 7 places to the left.

3. Write in scientific notation: The number is now 4.31 multiplied by 10 raised to the power of 7 (the number of places you moved the decimal).