Finding the Fourth Proportional to 1,147.98, 1,720.41 and 627.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,147.98 : 1,720.41 = 627.20 : x
2. Step 2: Convert to fraction form
   1,147.98/1,720.41 = 627.20/x
3. Step 3: Cross multiply
   1,147.98x = 1,720.41 × 627.20
4. Step 4: Simplify right side
   1,147.98x = 1,079,032.55
5. Step 5: Solve for x
   x = 1,079,032.55/1,147.98
6. Step 6: Final answer
   x = 939.94