Finding the Fourth Proportional to 1,100.40, 1,518.78 and 680.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.40 : 1,518.78 = 680.82 : x
2. Step 2: Convert to fraction form
   1,100.40/1,518.78 = 680.82/x
3. Step 3: Cross multiply
   1,100.40x = 1,518.78 × 680.82
4. Step 4: Simplify right side
   1,100.40x = 1,034,015.80
5. Step 5: Solve for x
   x = 1,034,015.80/1,100.40
6. Step 6: Final answer
   x = 939.67