Finding the Fourth Proportional to 3,128.34, 4,689.79 and 1,278.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.34 : 4,689.79 = 1,278.27 : x
2. Step 2: Convert to fraction form
   3,128.34/4,689.79 = 1,278.27/x
3. Step 3: Cross multiply
   3,128.34x = 4,689.79 × 1,278.27
4. Step 4: Simplify right side
   3,128.34x = 5,994,831.45
5. Step 5: Solve for x
   x = 5,994,831.45/3,128.34
6. Step 6: Final answer
   x = 1,916.30