Finding the Fourth Proportional to 2,219.78, 3,330.30 and 1,123.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,219.78 : 3,330.30 = 1,123.94 : x
2. Step 2: Convert to fraction form
   2,219.78/3,330.30 = 1,123.94/x
3. Step 3: Cross multiply
   2,219.78x = 3,330.30 × 1,123.94
4. Step 4: Simplify right side
   2,219.78x = 3,743,057.38
5. Step 5: Solve for x
   x = 3,743,057.38/2,219.78
6. Step 6: Final answer
   x = 1,686.23