Step 1: Move the decimal point from its current position (the black dot) to a position immediately to the right of the first nonzero digit (the red dot).
3.48626622.4
Step 2: We moved the decimal point 8 spaces to the right. Therefore, the exponent on base 10 will be positive 8.Now we know that the:
Mantissa = 3.486266224
Exponent = 8
So, the solution is:
$$348626622.4 = \color{blue}{ 3.486266224} \cdot 10^{ \color{red}{ 8 }}$$