Finding the Fourth Proportional to 1,112.56, 1,669.23 and 680.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.56 : 1,669.23 = 680.02 : x
2. Step 2: Convert to fraction form
   1,112.56/1,669.23 = 680.02/x
3. Step 3: Cross multiply
   1,112.56x = 1,669.23 × 680.02
4. Step 4: Simplify right side
   1,112.56x = 1,135,109.78
5. Step 5: Solve for x
   x = 1,135,109.78/1,112.56
6. Step 6: Final answer
   x = 1,020.27