Wenn ich das jetzt richtig verstanden habe, sind deine 191,74 die 100%, also möchtest du wissen, wieviel mehr 1525,50 in Prozent sind:
$${\frac{{\mathtt{1\,525.5}}}{{\mathtt{x}}}} = {\frac{{\mathtt{191.74}}}{{\mathtt{100}}}}$$
$${\mathtt{x}} = {\frac{{\mathtt{1\,525.5}}}{{\mathtt{191.74}}}}{\mathtt{\,\times\,}}{\mathtt{100}} \Rightarrow {\mathtt{x}} = {\mathtt{795.608\: \!636\: \!695\: \!525\: \!190\: \!4}}$$
1525, 50 sind also 795,61 % von 191,74.
Ansonsten, wenn die Frage lautet, wieviel 191,74 von 1525, 50 sind:
$${\frac{{\mathtt{x}}}{{\mathtt{191.74}}}} = {\frac{{\mathtt{100}}}{{\mathtt{1\,525.5}}}}$$
$${\mathtt{x}} = {\frac{{\mathtt{100}}}{{\mathtt{1\,525.5}}}}{\mathtt{\,\times\,}}{\mathtt{191.74}} \Rightarrow {\mathtt{x}} = {\mathtt{12.568\: \!993\: \!772\: \!533\: \!595\: \!5}}$$
Also 12,46 %
gruß