Finding the Fourth Proportional to 1,018.72, 1,524.56 and 628.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.72 : 1,524.56 = 628.57 : x
2. Step 2: Convert to fraction form
   1,018.72/1,524.56 = 628.57/x
3. Step 3: Cross multiply
   1,018.72x = 1,524.56 × 628.57
4. Step 4: Simplify right side
   1,018.72x = 958,285.06
5. Step 5: Solve for x
   x = 958,285.06/1,018.72
6. Step 6: Final answer
   x = 940.68