To find what plus -47.6 equals -23.1, you can set up the equation:
\( x + (-47.6) = -23.1 \)
This simplifies to:
\( x - 47.6 = -23.1 \)
Now, add 47.6 to both sides:
\( x = -23.1 + 47.6 \)
Calculating the right side:
\( x = 24.5 \)
So, \( 24.5 + (-47.6) = -23.1 \).
The answer is \( 24.5 \).