Finding the Fourth Proportional to 1,321.49, 1,980.74 and 627.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.49 : 1,980.74 = 627.59 : x
2. Step 2: Convert to fraction form
   1,321.49/1,980.74 = 627.59/x
3. Step 3: Cross multiply
   1,321.49x = 1,980.74 × 627.59
4. Step 4: Simplify right side
   1,321.49x = 1,243,084.28
5. Step 5: Solve for x
   x = 1,243,084.28/1,321.49
6. Step 6: Final answer
   x = 940.67