Finding the Fourth Proportional to 1,100.68, 1,518.36 and 680.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.68 : 1,518.36 = 680.89 : x
2. Step 2: Convert to fraction form
   1,100.68/1,518.36 = 680.89/x
3. Step 3: Cross multiply
   1,100.68x = 1,518.36 × 680.89
4. Step 4: Simplify right side
   1,100.68x = 1,033,836.14
5. Step 5: Solve for x
   x = 1,033,836.14/1,100.68
6. Step 6: Final answer
   x = 939.27