Finding the Fourth Proportional to 2,072.46, 3,109.18 and 918.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.46 : 3,109.18 = 918.54 : x
2. Step 2: Convert to fraction form
   2,072.46/3,109.18 = 918.54/x
3. Step 3: Cross multiply
   2,072.46x = 3,109.18 × 918.54
4. Step 4: Simplify right side
   2,072.46x = 2,855,906.20
5. Step 5: Solve for x
   x = 2,855,906.20/2,072.46
6. Step 6: Final answer
   x = 1,378.03