To arrange the given numbers in order from least to greatest, we can compare each value individually:
- \( 8.60232526 \) (approximately \( \sqrt{74} \))
- \( -1.9375 \) (which is \( -31/16 \))
- \( -2.96249606 \)
- \( 9.8125 \) (which is \( 9 \frac{13}{16} \))
Now, we will list them in order:
- The smallest number is \( -2.96249606 \).
- Next is \( -1.9375 \).
- Then, \( 8.60232526 \).
- Finally, the largest number is \( 9.8125 \).
So, the numbers in order from least to greatest are:
-2.96249606, -1.9375, 8.60232526, 9.8125.