Finding the Fourth Proportional to 1,123.79, 1,550.81 and 626.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.79 : 1,550.81 = 626.41 : x
2. Step 2: Convert to fraction form
   1,123.79/1,550.81 = 626.41/x
3. Step 3: Cross multiply
   1,123.79x = 1,550.81 × 626.41
4. Step 4: Simplify right side
   1,123.79x = 971,442.89
5. Step 5: Solve for x
   x = 971,442.89/1,123.79
6. Step 6: Final answer
   x = 864.43