Finding the Fourth Proportional to 3,111.24, 4,294.22 and 2,118.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.24 : 4,294.22 = 2,118.90 : x
2. Step 2: Convert to fraction form
   3,111.24/4,294.22 = 2,118.90/x
3. Step 3: Cross multiply
   3,111.24x = 4,294.22 × 2,118.90
4. Step 4: Simplify right side
   3,111.24x = 9,099,012.16
5. Step 5: Solve for x
   x = 9,099,012.16/3,111.24
6. Step 6: Final answer
   x = 2,924.56