Finding the Fourth Proportional to 2,223.27, 3,328.43 and 2,139.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,223.27 : 3,328.43 = 2,139.03 : x
2. Step 2: Convert to fraction form
   2,223.27/3,328.43 = 2,139.03/x
3. Step 3: Cross multiply
   2,223.27x = 3,328.43 × 2,139.03
4. Step 4: Simplify right side
   2,223.27x = 7,119,600.93
5. Step 5: Solve for x
   x = 7,119,600.93/2,223.27
6. Step 6: Final answer
   x = 3,202.31