Finding the Fourth Proportional to 2,217.90, 3,328.89 and 1,123.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.90 : 3,328.89 = 1,123.03 : x
2. Step 2: Convert to fraction form
   2,217.90/3,328.89 = 1,123.03/x
3. Step 3: Cross multiply
   2,217.90x = 3,328.89 × 1,123.03
4. Step 4: Simplify right side
   2,217.90x = 3,738,435.01
5. Step 5: Solve for x
   x = 3,738,435.01/2,217.90
6. Step 6: Final answer
   x = 1,685.58