You can solve this problem as follows:
1. Let's call the amount: "y".
2. The exercise says that 4376 which is 20% of its goal, so we have:
y=4376
20% of its goal=4376
3. Then, we have the equation below:
20y/100=4376
0.20y=4376
4. When we clear the variable "y", we obtain:
y=4376/0.20
y=21880
5. Finally, we will have:
21880-4376=17504
6. How much more must be raised?
The anwer is: 17504