अन्वयः

तत्र there, यथान्यायम् as per shastras, प्रमाणत: with standard measurement, इष्टका: bricks, कारिता were made, शुल्बकर्मणि in the science of construction using a measuring rope, कुशलै: accomplished, ब्राह्मणै: brahmins, अग्नि: sacrificial fire place, चित: gathered and laid bricks were prepared as per standard measurment mentioned in shastras.

M N Dutt

And an adequate number of bricks was also duly made (for the ceremony.) And Brāhmaṇas accomplished in the arts constructed the sacrificial fire-place with those bricks.

Summary

The sacrificial fireplace was constructed with bricks with standard measurement by brahmins who were experts in the art of measuring land with a string or single strand.

पदच्छेदः

इष्टकाश्	इष्टका (१.३)
च	च (अव्ययः)
यथान्यायं	यथान्यायम् (अव्ययः)
कारिताश्	कारित (√कारय् + क्त, १.३)
च	च (अव्ययः)
प्रमाणतः	प्रमाण (५.१)
चितो	चित (√चि + क्त, १.१)
ऽग्निर्	अग्नि (१.१)
ब्राह्मणैस्	ब्राह्मण (३.३)
तत्र	तत्र (अव्ययः)
कुशलैः	कुशल (३.३)
शुल्बकर्मणि	शुल्ब–कर्मन् (७.१)

छन्दः

अनुष्टुप् [८]

छन्दोविश्लेषणम्

१	२	३	४	५	६	७	८
इ	ष्ट	का	श्च	य	था	न्या	यं
का	रि	ता	श्च	प्र	मा	ण	तः
चि	तो	ऽग्नि	र्ब्रा	ह्म	णै	स्त	त्र
कु	श	लैः	शु	ल्ब	क	र्म	णि