Convert the octal value 7258 into hexadecimal.

Sure, here are the steps to convert the octal value 7258 into hexadecimal:

1. Convert the octal number to decimal first. The octal number system is base 8, so each digit represents a power of 8.

   8^3 * 7 + 8^2 * 2 + 8^1 * 5 + 8^0 * 8 = 3656 + 128 + 40 + 8 = 3832

2. Now, convert the decimal number to hexadecimal. The hexadecimal system is base 16.

   3832 / 16 = 239 remainder 4. 4 in hexadecimal is 4. 239 / 16 = 14 remainder 15. 15 in hexadecimal is F. 14 / 16 = 0 remainder 14. 14 in hexadecimal is E.

3. Write down the remainders in reverse order of calculation.

   So, the hexadecimal equivalent of the octal number 7258 is EF4.