Finding the Fourth Proportional to 1,013.94, 1,517.67 and 720.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.94 : 1,517.67 = 720.72 : x
2. Step 2: Convert to fraction form
   1,013.94/1,517.67 = 720.72/x
3. Step 3: Cross multiply
   1,013.94x = 1,517.67 × 720.72
4. Step 4: Simplify right side
   1,013.94x = 1,093,815.12
5. Step 5: Solve for x
   x = 1,093,815.12/1,013.94
6. Step 6: Final answer
   x = 1,078.78