Here's how we get there:

1. Move the decimal point to the right until you have a number between 1 and 10. In this case, we move it 7 places to the right, giving us 4.32.

2. Count the number of places you moved the decimal. This is your exponent. Since we moved it 7 places to the right, the exponent is -7.

3. Combine the number and the exponent. This gives us 4.32 x 10⁻⁷.