Finding the Fourth Proportional to 2,218.42, 3,328.54 and 1,123.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.42 : 3,328.54 = 1,123.10 : x
2. Step 2: Convert to fraction form
   2,218.42/3,328.54 = 1,123.10/x
3. Step 3: Cross multiply
   2,218.42x = 3,328.54 × 1,123.10
4. Step 4: Simplify right side
   2,218.42x = 3,738,283.27
5. Step 5: Solve for x
   x = 3,738,283.27/2,218.42
6. Step 6: Final answer
   x = 1,685.11