Finding the Fourth Proportional to 2,078.72, 3,118.40 and 846.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.72 : 3,118.40 = 846.23 : x
2. Step 2: Convert to fraction form
   2,078.72/3,118.40 = 846.23/x
3. Step 3: Cross multiply
   2,078.72x = 3,118.40 × 846.23
4. Step 4: Simplify right side
   2,078.72x = 2,638,863.81
5. Step 5: Solve for x
   x = 2,638,863.81/2,078.72
6. Step 6: Final answer
   x = 1,269.47