I am the cell reference of the last cell in an MS Excel 2010 worksheet
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Answer:
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The solution to this problem depends on whether you can count on the data in column B containing blank cells or not. If the data is contiguous—it doesn't contain any blank cells—then you can use the following formula in C4:
=INDIRECT("B"&COUNTA(B:B))
This constructs an address based on the last cell in the column, and then uses the INDIRECT function to return the value at that address.
If it is possible for there to be blanks in column B, then the following formula will work:
=INDIRECT("B"&MAX(ROW(1:1048576)*(B1:1048576<>"")))
Again, the INDIRECT function is used to fetch the actual value, but the address used by INDIRECT is put together differently.
A different approach is to use the VLOOKUP function to return the value. If column B consists of numeric values, then the following formula in C4 will work just fine:
=VLOOKUP(9.99999999999999E+307,B:B,1)
If column B contains text, then the numeric lookup won't work, but the following will:
=VLOOKUP(REPT("z",50),B:B,1)
Explanation: