Since angles ∠1 and ∠3 are vertical angles, they are equal in measure. So, we can set up the equation:
\[ m∠1 = m∠3 \]
Substituting the given values:
\[ 4x + 26 = 98 \]
Now, solve for \( x \):
- Subtract 26 from both sides:
\[ 4x = 98 - 26 \]
\[ 4x = 72 \]
- Divide both sides by 4:
\[ x = \frac{72}{4} \]
\[ x = 18 \]
So, the value of \( x \) is \( \boxed{18} \).