Finding the Fourth Proportional to 1,123.58, 1,550.43 and 626.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.58 : 1,550.43 = 626.20 : x
2. Step 2: Convert to fraction form
   1,123.58/1,550.43 = 626.20/x
3. Step 3: Cross multiply
   1,123.58x = 1,550.43 × 626.20
4. Step 4: Simplify right side
   1,123.58x = 970,879.27
5. Step 5: Solve for x
   x = 970,879.27/1,123.58
6. Step 6: Final answer
   x = 864.09