Finding the Fourth Proportional to 1,123.69, 1,687.20 and 1,104.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.69 : 1,687.20 = 1,104.03 : x
2. Step 2: Convert to fraction form
   1,123.69/1,687.20 = 1,104.03/x
3. Step 3: Cross multiply
   1,123.69x = 1,687.20 × 1,104.03
4. Step 4: Simplify right side
   1,123.69x = 1,862,719.42
5. Step 5: Solve for x
   x = 1,862,719.42/1,123.69
6. Step 6: Final answer
   x = 1,657.68