Finding the Fourth Proportional to 1,100.13, 1,518.69 and 680.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.13 : 1,518.69 = 680.71 : x
2. Step 2: Convert to fraction form
   1,100.13/1,518.69 = 680.71/x
3. Step 3: Cross multiply
   1,100.13x = 1,518.69 × 680.71
4. Step 4: Simplify right side
   1,100.13x = 1,033,787.47
5. Step 5: Solve for x
   x = 1,033,787.47/1,100.13
6. Step 6: Final answer
   x = 939.70