Finding the Fourth Proportional to 1,123.38, 1,550.61 and 1,086.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.38 : 1,550.61 = 1,086.90 : x
2. Step 2: Convert to fraction form
   1,123.38/1,550.61 = 1,086.90/x
3. Step 3: Cross multiply
   1,123.38x = 1,550.61 × 1,086.90
4. Step 4: Simplify right side
   1,123.38x = 1,685,358.01
5. Step 5: Solve for x
   x = 1,685,358.01/1,123.38
6. Step 6: Final answer
   x = 1,500.26