Finding the Fourth Proportional to 1,438.83, 1,983.45 and 1,123.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.83 : 1,983.45 = 1,123.41 : x
2. Step 2: Convert to fraction form
   1,438.83/1,983.45 = 1,123.41/x
3. Step 3: Cross multiply
   1,438.83x = 1,983.45 × 1,123.41
4. Step 4: Simplify right side
   1,438.83x = 2,228,227.56
5. Step 5: Solve for x
   x = 2,228,227.56/1,438.83
6. Step 6: Final answer
   x = 1,548.64