Finding the Fourth Proportional to 2,678.96, 4,020.60 and 1,447.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,678.96 : 4,020.60 = 1,447.76 : x
2. Step 2: Convert to fraction form
   2,678.96/4,020.60 = 1,447.76/x
3. Step 3: Cross multiply
   2,678.96x = 4,020.60 × 1,447.76
4. Step 4: Simplify right side
   2,678.96x = 5,820,863.86
5. Step 5: Solve for x
   x = 5,820,863.86/2,678.96
6. Step 6: Final answer
   x = 2,172.81