Finding the Fourth Proportional to 1,638.15, 2,456.80 and 1,118.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.15 : 2,456.80 = 1,118.06 : x
2. Step 2: Convert to fraction form
   1,638.15/2,456.80 = 1,118.06/x
3. Step 3: Cross multiply
   1,638.15x = 2,456.80 × 1,118.06
4. Step 4: Simplify right side
   1,638.15x = 2,746,831.93
5. Step 5: Solve for x
   x = 2,746,831.93/1,638.15
6. Step 6: Final answer
   x = 1,676.79