Finding the Fourth Proportional to 1,123.57, 1,550.55 and 626.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.57 : 1,550.55 = 626.23 : x
2. Step 2: Convert to fraction form
   1,123.57/1,550.55 = 626.23/x
3. Step 3: Cross multiply
   1,123.57x = 1,550.55 × 626.23
4. Step 4: Simplify right side
   1,123.57x = 971,000.93
5. Step 5: Solve for x
   x = 971,000.93/1,123.57
6. Step 6: Final answer
   x = 864.21