Finding the Fourth Proportional to 2,273.91, 3,408.79 and 812.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,273.91 : 3,408.79 = 812.72 : x
2. Step 2: Convert to fraction form
   2,273.91/3,408.79 = 812.72/x
3. Step 3: Cross multiply
   2,273.91x = 3,408.79 × 812.72
4. Step 4: Simplify right side
   2,273.91x = 2,770,391.81
5. Step 5: Solve for x
   x = 2,770,391.81/2,273.91
6. Step 6: Final answer
   x = 1,218.34