Finding the Fourth Proportional to 1,123.58, 1,550.57 and 626.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.58 : 1,550.57 = 626.28 : x
2. Step 2: Convert to fraction form
   1,123.58/1,550.57 = 626.28/x
3. Step 3: Cross multiply
   1,123.58x = 1,550.57 × 626.28
4. Step 4: Simplify right side
   1,123.58x = 971,087.85
5. Step 5: Solve for x
   x = 971,087.85/1,123.58
6. Step 6: Final answer
   x = 864.28