Explanation:

Let’s break down the series: 19.7, 17.3, 22.1, 14.9, 24.5, 12.2, 26.9

- Look at alternate terms:

- 19.7, 22.1, 24.5, 26.9 (first, third, fifth, seventh)

- Each increases by about 2.4:

- 19.7 + 2.4 = 22.1

- 22.1 + 2.4 = 24.5

- 24.5 + 2.4 = 26.9

- Now check the remaining alternates:

- 17.3, 14.9, 12.2 (second, fourth, sixth)

- Each decreases by about 2.4:

- 17.3 - 2.4 = 14.9

- 14.9 - 2.7 = 12.2 (difference is -2.7, not -2.4; should be 14.9 - 2.4 = 12.5, not 12.2)

- So, 12.2 is inconsistent. All others fit the pattern.

Option analysis:

- Option 1 (24.5): Follows the pattern.

- Option 2 (22.1): Follows the pattern.

- Option 3 (17.3): Follows the pattern.

- Option 4 (12.2): Breaks the pattern, should be 12.5.

- Option 5 (14.9): Follows the pattern.

Correct Answer: Option 4, 12.2