Finding the Fourth Proportional to 3,991.88, 5,507.39 and 2,223.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,991.88 : 5,507.39 = 2,223.15 : x
2. Step 2: Convert to fraction form
   3,991.88/5,507.39 = 2,223.15/x
3. Step 3: Cross multiply
   3,991.88x = 5,507.39 × 2,223.15
4. Step 4: Simplify right side
   3,991.88x = 12,243,738.98
5. Step 5: Solve for x
   x = 12,243,738.98/3,991.88
6. Step 6: Final answer
   x = 3,067.16