Finding the Fourth Proportional to 2,007.81, 3,016.58 and 1,278.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.81 : 3,016.58 = 1,278.81 : x
2. Step 2: Convert to fraction form
   2,007.81/3,016.58 = 1,278.81/x
3. Step 3: Cross multiply
   2,007.81x = 3,016.58 × 1,278.81
4. Step 4: Simplify right side
   2,007.81x = 3,857,626.28
5. Step 5: Solve for x
   x = 3,857,626.28/2,007.81
6. Step 6: Final answer
   x = 1,921.31