Finding the Fourth Proportional to 2,078.78, 3,118.09 and 845.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.78 : 3,118.09 = 845.82 : x
2. Step 2: Convert to fraction form
   2,078.78/3,118.09 = 845.82/x
3. Step 3: Cross multiply
   2,078.78x = 3,118.09 × 845.82
4. Step 4: Simplify right side
   2,078.78x = 2,637,342.88
5. Step 5: Solve for x
   x = 2,637,342.88/2,078.78
6. Step 6: Final answer
   x = 1,268.70