Finding the Fourth Proportional to 2,218.31, 3,329.51 and 1,123.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.31 : 3,329.51 = 1,123.44 : x
2. Step 2: Convert to fraction form
   2,218.31/3,329.51 = 1,123.44/x
3. Step 3: Cross multiply
   2,218.31x = 3,329.51 × 1,123.44
4. Step 4: Simplify right side
   2,218.31x = 3,740,499.10
5. Step 5: Solve for x
   x = 3,740,499.10/2,218.31
6. Step 6: Final answer
   x = 1,686.20