Finding the Fourth Proportional to 5,676.32, 7,826.86 and 3,997.20

Step by Step Solution

1. Step 1: Write the proportion equation
   5,676.32 : 7,826.86 = 3,997.20 : x
2. Step 2: Convert to fraction form
   5,676.32/7,826.86 = 3,997.20/x
3. Step 3: Cross multiply
   5,676.32x = 7,826.86 × 3,997.20
4. Step 4: Simplify right side
   5,676.32x = 31,285,524.79
5. Step 5: Solve for x
   x = 31,285,524.79/5,676.32
6. Step 6: Final answer
   x = 5,511.59