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).

5.5639678631.5

Step 2: We moved the decimal point 10 spaces to the right. Therefore, the exponent on base 10 will be positive 10.Now we know that the:

Mantissa = 5.56396786315

Exponent = 10

So, the solution is: