What is the quantity sold for a specific fruit & country combination?
Minimize

If I understand your question correctly, you want to solve an optimization problem. Using two countries and two fruits as an example, the problem can be written as a linear program:

Minimize

$$\Delta = \delta_{Apple} + \delta_{Mango} + \delta_{India} + \delta_{China}$$

s.t.

$$X_{India, Apple} + X_{China, Apple} = 508 + \delta_{Apple}$$
$$X_{India, Mango} + X_{China, Mango} = 608 + \delta_{Mango}$$
$$X_{India, Apple} + X_{India, Mango} = 1403 + \delta_{India}$$
$$X_{China, Apple} + X_{China, Mango} = 1370 + \delta_{China}$$

A simple optimization problem like this can be solved using many software packages, including Excel. Note that it is likely that the solution is not unique.