Answer
Approximately 16.892ml.
Work Step by Step
In a dilution, we can use this formula to find the concentration or the volume we want:
$C_1 * V_1 = C_2 * V_2$
$14.8 * V_1 = 0.25 * 1000$
$V_1 = \frac{250}{14.8}$
$V_1 \approx 16.892ml$