math question

.51988 trillion/2.37 trillion  = .21935865

$\dfrac{519.88\text{ billion}}{2.37\text{ trillion}}\\ =\dfrac{519.88\times 10^9}{2.37 \times 10^{12}}\\ = \dfrac{519.88}{2.37\times 10^3}\\ =\dfrac{519.88}{2370}\\ \text{So the answer is approximately 1/4.}$

Exact value approx. eq. 0.219