Finding the Fourth Proportional to 2,809.72, 4,213.74 and 1,078.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,809.72 : 4,213.74 = 1,078.12 : x
2. Step 2: Convert to fraction form
   2,809.72/4,213.74 = 1,078.12/x
3. Step 3: Cross multiply
   2,809.72x = 4,213.74 × 1,078.12
4. Step 4: Simplify right side
   2,809.72x = 4,542,917.37
5. Step 5: Solve for x
   x = 4,542,917.37/2,809.72
6. Step 6: Final answer
   x = 1,616.86