Handling Decimals on Embedded C

I have my code below and I want to ask what's the best way in solving numbers (division, multiplication, logarithm, exponents) up to 4 decimals places? I'm using PIC16F1789 as my device.

float sensorValue;
float sensorAverage;

void main(){
    //Get an average data by testing 100 times
    for(int x = 0; x < 100; x++){
        // Get the total sum of all 100 data
        sensorValue = (sensorValue + ADC_GetConversion(SENSOR));
    }

    // Get the average
    sensorAverage = sensorValue/100.0;
}

via Chebli Mohamed