Finding the Fourth Proportional to 3,991.81, 5,508.69 and 2,223.83

Step by Step Solution

1. Step 1: Write the proportion equation
   3,991.81 : 5,508.69 = 2,223.83 : x
2. Step 2: Convert to fraction form
   3,991.81/5,508.69 = 2,223.83/x
3. Step 3: Cross multiply
   3,991.81x = 5,508.69 × 2,223.83
4. Step 4: Simplify right side
   3,991.81x = 12,250,403.85
5. Step 5: Solve for x
   x = 12,250,403.85/3,991.81
6. Step 6: Final answer
   x = 3,068.88