Finding the Fourth Proportional to 3,900.50, 5,381.90 and 2,222.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,900.50 : 5,381.90 = 2,222.18 : x
2. Step 2: Convert to fraction form
   3,900.50/5,381.90 = 2,222.18/x
3. Step 3: Cross multiply
   3,900.50x = 5,381.90 × 2,222.18
4. Step 4: Simplify right side
   3,900.50x = 11,959,550.54
5. Step 5: Solve for x
   x = 11,959,550.54/3,900.50
6. Step 6: Final answer
   x = 3,066.16