Finding the Fourth Proportional to 3,990.45, 5,506.88 and 2,222.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.45 : 5,506.88 = 2,222.10 : x
2. Step 2: Convert to fraction form
   3,990.45/5,506.88 = 2,222.10/x
3. Step 3: Cross multiply
   3,990.45x = 5,506.88 × 2,222.10
4. Step 4: Simplify right side
   3,990.45x = 12,236,826.94
5. Step 5: Solve for x
   x = 12,236,826.94/3,990.45
6. Step 6: Final answer
   x = 3,066.53