Finding the Fourth Proportional to 3,990.51, 5,506.83 and 2,222.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.51 : 5,506.83 = 2,222.15 : x
2. Step 2: Convert to fraction form
   3,990.51/5,506.83 = 2,222.15/x
3. Step 3: Cross multiply
   3,990.51x = 5,506.83 × 2,222.15
4. Step 4: Simplify right side
   3,990.51x = 12,236,974.75
5. Step 5: Solve for x
   x = 12,236,974.75/3,990.51
6. Step 6: Final answer
   x = 3,066.52