Finding the Fourth Proportional to 3,990.42, 5,507.10 and 2,222.19

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.42 : 5,507.10 = 2,222.19 : x
2. Step 2: Convert to fraction form
   3,990.42/5,507.10 = 2,222.19/x
3. Step 3: Cross multiply
   3,990.42x = 5,507.10 × 2,222.19
4. Step 4: Simplify right side
   3,990.42x = 12,237,822.55
5. Step 5: Solve for x
   x = 12,237,822.55/3,990.42
6. Step 6: Final answer
   x = 3,066.80