Final answer:
To convert from octal to hexadecimal, first convert to decimal and then to hexadecimal.
Step-by-step explanation:
To convert a number from octal to hexadecimal, we first need to convert it from octal to decimal and then from decimal to hexadecimal.
a. 136572 in octal = 58378 in decimal = E472 in hexadecimal.
b. 177630.255254 in octal = 124172.331222 in decimal = 3A198.51CDA in hexadecimal.