Finding the Fourth Proportional to 1,375.10, 2,061.14 and 680.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.10 : 2,061.14 = 680.74 : x
2. Step 2: Convert to fraction form
   1,375.10/2,061.14 = 680.74/x
3. Step 3: Cross multiply
   1,375.10x = 2,061.14 × 680.74
4. Step 4: Simplify right side
   1,375.10x = 1,403,100.44
5. Step 5: Solve for x
   x = 1,403,100.44/1,375.10
6. Step 6: Final answer
   x = 1,020.36