Finding the Fourth Proportional to 3,991.72, 5,508.83 and 2,223.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,991.72 : 5,508.83 = 2,223.60 : x
2. Step 2: Convert to fraction form
   3,991.72/5,508.83 = 2,223.60/x
3. Step 3: Cross multiply
   3,991.72x = 5,508.83 × 2,223.60
4. Step 4: Simplify right side
   3,991.72x = 12,249,434.39
5. Step 5: Solve for x
   x = 12,249,434.39/3,991.72
6. Step 6: Final answer
   x = 3,068.71