Finding the Fourth Proportional to 5,811.64, 8,021.82 and 3,949.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,811.64 : 8,021.82 = 3,949.72 : x
2. Step 2: Convert to fraction form
   5,811.64/8,021.82 = 3,949.72/x
3. Step 3: Cross multiply
   5,811.64x = 8,021.82 × 3,949.72
4. Step 4: Simplify right side
   5,811.64x = 31,683,942.89
5. Step 5: Solve for x
   x = 31,683,942.89/5,811.64
6. Step 6: Final answer
   x = 5,451.81