Finding the Fourth Proportional to 2,149.40, 3,222.30 and 1,123.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,149.40 : 3,222.30 = 1,123.40 : x
2. Step 2: Convert to fraction form
   2,149.40/3,222.30 = 1,123.40/x
3. Step 3: Cross multiply
   2,149.40x = 3,222.30 × 1,123.40
4. Step 4: Simplify right side
   2,149.40x = 3,619,931.82
5. Step 5: Solve for x
   x = 3,619,931.82/2,149.40
6. Step 6: Final answer
   x = 1,684.16