Finding the Fourth Proportional to 1,123.55, 1,550.60 and 626.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.55 : 1,550.60 = 626.28 : x
2. Step 2: Convert to fraction form
   1,123.55/1,550.60 = 626.28/x
3. Step 3: Cross multiply
   1,123.55x = 1,550.60 × 626.28
4. Step 4: Simplify right side
   1,123.55x = 971,106.64
5. Step 5: Solve for x
   x = 971,106.64/1,123.55
6. Step 6: Final answer
   x = 864.32