Finding the Fourth Proportional to 3,991.34, 5,507.88 and 2,222.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,991.34 : 5,507.88 = 2,222.90 : x
2. Step 2: Convert to fraction form
   3,991.34/5,507.88 = 2,222.90/x
3. Step 3: Cross multiply
   3,991.34x = 5,507.88 × 2,222.90
4. Step 4: Simplify right side
   3,991.34x = 12,243,466.45
5. Step 5: Solve for x
   x = 12,243,466.45/3,991.34
6. Step 6: Final answer
   x = 3,067.51