Finding the Fourth Proportional to 4,105.91, 5,649.74 and 3,991.09

Step by Step Solution

1. Step 1: Write the proportion equation
   4,105.91 : 5,649.74 = 3,991.09 : x
2. Step 2: Convert to fraction form
   4,105.91/5,649.74 = 3,991.09/x
3. Step 3: Cross multiply
   4,105.91x = 5,649.74 × 3,991.09
4. Step 4: Simplify right side
   4,105.91x = 22,548,620.82
5. Step 5: Solve for x
   x = 22,548,620.82/4,105.91
6. Step 6: Final answer
   x = 5,491.75