Finding the Fourth Proportional to 1,100.57, 1,518.81 and 680.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.57 : 1,518.81 = 680.94 : x
2. Step 2: Convert to fraction form
   1,100.57/1,518.81 = 680.94/x
3. Step 3: Cross multiply
   1,100.57x = 1,518.81 × 680.94
4. Step 4: Simplify right side
   1,100.57x = 1,034,215.93
5. Step 5: Solve for x
   x = 1,034,215.93/1,100.57
6. Step 6: Final answer
   x = 939.71