Finding the Fourth Proportional to 2,078.91, 3,118.31 and 846

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.91 : 3,118.31 = 846 : x
2. Step 2: Convert to fraction form
   2,078.91/3,118.31 = 846/x
3. Step 3: Cross multiply
   2,078.91x = 3,118.31 × 846
4. Step 4: Simplify right side
   2,078.91x = 2,638,086.03
5. Step 5: Solve for x
   x = 2,638,086.03/2,078.91
6. Step 6: Final answer
   x = 1,268.98