Finding the Fourth Proportional to 3,990.69, 5,506.77 and 2,222.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.69 : 5,506.77 = 2,222.25 : x
2. Step 2: Convert to fraction form
   3,990.69/5,506.77 = 2,222.25/x
3. Step 3: Cross multiply
   3,990.69x = 5,506.77 × 2,222.25
4. Step 4: Simplify right side
   3,990.69x = 12,237,419.63
5. Step 5: Solve for x
   x = 12,237,419.63/3,990.69
6. Step 6: Final answer
   x = 3,066.49