Finding the Fourth Proportional to 1,123.74, 1,550.80 and 626.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.74 : 1,550.80 = 626.42 : x
2. Step 2: Convert to fraction form
   1,123.74/1,550.80 = 626.42/x
3. Step 3: Cross multiply
   1,123.74x = 1,550.80 × 626.42
4. Step 4: Simplify right side
   1,123.74x = 971,452.14
5. Step 5: Solve for x
   x = 971,452.14/1,123.74
6. Step 6: Final answer
   x = 864.48