1. **Find x given the equation:** $$\frac{x}{20} = \frac{70}{10}$$ 2. **Cross multiply to solve for x:** $$x \times 10 = 70 \times 20$$ 3. **Simplify the multiplication:** $$10x = 1400$$ 4. **Divide both sides by 10 to isolate x:** $$\frac{\cancel{10}x}{\cancel{10}} = \frac{1400}{10}$$ 5. **Simplify the division:** $$x = 140$$ **Final answer:** $$x = 140$$