Finding the Fourth Proportional to 2,078.78, 3,119.00 and 845.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.78 : 3,119.00 = 845.87 : x
2. Step 2: Convert to fraction form
   2,078.78/3,119.00 = 845.87/x
3. Step 3: Cross multiply
   2,078.78x = 3,119.00 × 845.87
4. Step 4: Simplify right side
   2,078.78x = 2,638,255.05
5. Step 5: Solve for x
   x = 2,638,255.05/2,078.78
6. Step 6: Final answer
   x = 1,269.14