What approximate value should come in place of the question mark (?) in the following question.

3543.98 + 310.11 - 456.87 - ? = 2023.89

​$$\frac{779.23}{13} + 4.98 + 23 = \frac{x}{100} \times 60.03$$​​

What approximate value will come in place of question mark (?) in the following questions? (You are not expected to calculate the exact value)
3/7th of 83 + ? = 234.99 × 2.99

What approximate value will come in place of question mark (?) in the following questions? (You are not expected to calculate the exact value)
(4.12²× 11.99) + ? = 45.22% of 5000

1259.909 ÷ 12.106 ÷ 6.979 + 37.8982 – 29.9023 = ?

​$$7364.99 + (5.01)^2 + \sqrt{?} = 7433.11$$​​