Finding the Fourth Proportional to 1,123.68, 1,550.59 and 626.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.68 : 1,550.59 = 626.30 : x
2. Step 2: Convert to fraction form
   1,123.68/1,550.59 = 626.30/x
3. Step 3: Cross multiply
   1,123.68x = 1,550.59 × 626.30
4. Step 4: Simplify right side
   1,123.68x = 971,134.52
5. Step 5: Solve for x
   x = 971,134.52/1,123.68
6. Step 6: Final answer
   x = 864.24