Finding the Fourth Proportional to 5,767.85, 8,665.61 and 3,691.91

Step by Step Solution

1. Step 1: Write the proportion equation
   5,767.85 : 8,665.61 = 3,691.91 : x
2. Step 2: Convert to fraction form
   5,767.85/8,665.61 = 3,691.91/x
3. Step 3: Cross multiply
   5,767.85x = 8,665.61 × 3,691.91
4. Step 4: Simplify right side
   5,767.85x = 31,992,590.43
5. Step 5: Solve for x
   x = 31,992,590.43/5,767.85
6. Step 6: Final answer
   x = 5,546.71