Finding the Fourth Proportional to 1,020.73, 1,408.72 and 627.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.73 : 1,408.72 = 627.75 : x
2. Step 2: Convert to fraction form
   1,020.73/1,408.72 = 627.75/x
3. Step 3: Cross multiply
   1,020.73x = 1,408.72 × 627.75
4. Step 4: Simplify right side
   1,020.73x = 884,321.82
5. Step 5: Solve for x
   x = 884,321.82/1,020.73
6. Step 6: Final answer
   x = 866.37