Finding the Fourth Proportional to 3,990.57, 5,506.90 and 2,222.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.57 : 5,506.90 = 2,222.34 : x
2. Step 2: Convert to fraction form
   3,990.57/5,506.90 = 2,222.34/x
3. Step 3: Cross multiply
   3,990.57x = 5,506.90 × 2,222.34
4. Step 4: Simplify right side
   3,990.57x = 12,238,198.59
5. Step 5: Solve for x
   x = 12,238,198.59/3,990.57
6. Step 6: Final answer
   x = 3,066.78