Finding the Fourth Proportional to 1,123.65, 1,550.45 and 626.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.65 : 1,550.45 = 626.28 : x
2. Step 2: Convert to fraction form
   1,123.65/1,550.45 = 626.28/x
3. Step 3: Cross multiply
   1,123.65x = 1,550.45 × 626.28
4. Step 4: Simplify right side
   1,123.65x = 971,012.69
5. Step 5: Solve for x
   x = 971,012.69/1,123.65
6. Step 6: Final answer
   x = 864.16