Finding the Fourth Proportional to 1,123.80, 1,557.84 and 1,103.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.80 : 1,557.84 = 1,103.58 : x
2. Step 2: Convert to fraction form
   1,123.80/1,557.84 = 1,103.58/x
3. Step 3: Cross multiply
   1,123.80x = 1,557.84 × 1,103.58
4. Step 4: Simplify right side
   1,123.80x = 1,719,201.07
5. Step 5: Solve for x
   x = 1,719,201.07/1,123.80
6. Step 6: Final answer
   x = 1,529.81