Which chapter of the manga version of Hyouka corresponds to the last episode of anime?
As of 26 October 2017, the manga consisted of 11 volumes and was still on-going.

Regarding the corresponding chapter to the last episode of the anime (episode 22: "The Hina Doll that Took a Detour"), as of February 2018, the answer is not yet, but possibly will be in volume 12.



As a matter of fact, Hyouka is originally a light novel series. Both the anime and the manga were based on it.

For reference, these are the current 6 volumes of the light novel (from Wikipedia):


Hyōka
Closing Credits of the Fool
The Order of Kudryavka
The Hina Doll that Took a Detour (compilation of short stories)
The Approximation of the Distance of Two
Even Though I'm Told I Now Have Wings (compilation of short stories)


The anime's order (from Japanese Wikipedia):


Episode 1:


Part A: Hyōka (1)
Part B: The Hina Doll that Took a Detour (4)

Episode 2-5: Hyōka (1)
Episode 6-7: The Hina Doll that Took a Detour (4)
Episode 8-11: Closing Credits of the Fool (2)
Episode 11.5 (OVA): anime original story
Episode 12-17: The Order of Kudryavka (3)
Episode 18: Even Though I'm Told I Now Have Wings (6)
Episode 19-22: The Hina Doll that Took a Detour (4)


And for the manga (from Japanese Wikipedia):


Volume 1: Hyōka (1), The Hina Doll that Took a Detour (4)
Volume 2: Hyōka (1), The Hina Doll that Took a Detour (4)
Volume 3: Hyōka (1), The Hina Doll that Took a Detour (4), Closing Credits of the Fool (2)
Volume 4-5: Closing Credits of the Fool (2)
Volume 6: Anime ch. 11.5 (OVA), The Order of Kudryavka (3)
Volume 7-9: The Order of Kudryavka (3)
Volume 10: The Order of Kudryavka (3), Even Though I'm Told I Now Have Wings (6), The Hina Doll that Took a Detour (4)
Volume 11: The Hina Doll that Took a Detour (4)




For comparison, volume 11 consists of:


Chapter 43: Christmas in the Box
Chapter 44: Sappy New Year (1)
Chapter 45: Sappy New Year (2)
Chapter 46: The Homemade Chocolates Case


and the last 4 episodes (from Wikipedia) are:


Episode 19: Anyone Who Knows
Episode 20: Sappy New Year
Episode 21: The Homemade Chocolates Case
Episode 22: The Hina Doll that Took a Detour