Finding the Fourth Proportional to 2,279.78, 3,418.98 and 892.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.78 : 3,418.98 = 892.79 : x
2. Step 2: Convert to fraction form
   2,279.78/3,418.98 = 892.79/x
3. Step 3: Cross multiply
   2,279.78x = 3,418.98 × 892.79
4. Step 4: Simplify right side
   2,279.78x = 3,052,414.06
5. Step 5: Solve for x
   x = 3,052,414.06/2,279.78
6. Step 6: Final answer
   x = 1,338.91