So, the gist of the problem is this: We want to get the first non-blank cell, but we don't have a direct way to do that in Excel. We could use VLOOKUP with a wildcard * (see link below), but that will only work for text, not numbers.
So, we need to build the functionality we need by nesting formulas. On way to do that is to use an array function that "tests" cells and returns an array of TRUE/FALSE values that we can feed into the MATCH function.
Each FALSE represents a cell in the range that is not blank.
Next, MATCH looks for FALSE inside the array and returns the position of the first match found, in this case 2. At this point, the formula in the example now looks like this:
Finally, the INDEX function takes over and gets the value at position 2 in the array, which is 10.
First non-zero length value
To get the first non-zero length value, you can include the LEN function like this:
First numeric value
To get the first numeric value in a list, you can adapt the formula to use the ISNUMBER function, then change the logic to match TRUE instead of FALSE:
This is also an array formula, and must be entered with control+shift+enter.