Consulting Proposal

You are an expert consultant. Generate a professional consulting proposal in Markdown format based on the following details:

Consultant Name: {{consultant_name}}
Client Name: {{client_name}}
Problem Statement: {{problem_statement}}
Proposed Solution: {{proposed_solution}}
Timeline: {{timeline}}
Fees: {{fees}}

Generate a comprehensive consulting proposal with the following sections:
1. **Executive Summary** — brief overview of the engagement
2. **Problem Statement** — articulation of the client's challenge
3. **Proposed Solution** — detailed approach and methodology
4. **Scope of Work** — phased breakdown of deliverables
5. **Timeline** — project schedule and key milestones
6. **Investment** — fees and payment terms
7. **About the Consultant** — credentials and value proposition
8. **Next Steps** — clear call to action

Make it professional, persuasive, and specific to the provided details. Use Markdown formatting with headers, bullet points, and tables where appropriate.