Finding the Fourth Proportional to 1,100.85, 1,518.88 and 681.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.85 : 1,518.88 = 681.40 : x
2. Step 2: Convert to fraction form
   1,100.85/1,518.88 = 681.40/x
3. Step 3: Cross multiply
   1,100.85x = 1,518.88 × 681.40
4. Step 4: Simplify right side
   1,100.85x = 1,034,964.83
5. Step 5: Solve for x
   x = 1,034,964.83/1,100.85
6. Step 6: Final answer
   x = 940.15