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data-reconciliation

Recover missing spreadsheet values from row and column totals, percentage shares, year-over-year changes, CAGR relationships, and cross-sheet constraints.

tasks/xlsx-recover-data/environment/skills/data-reconciliation/SKILL.md

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# Data Reconciliation for Spreadsheets

Techniques for recovering missing values from financial and tabular data using mathematical constraints.

## Core Principles

### 1. Row/Column Sum Constraints
When totals are provided, missing values can be recovered:

```
Missing = Total - Sum(Known Values)
```

Example: If a row sums to 1000 and you know 3 of 4 values (200, 300, 400), the missing value is: