Finding the Fourth Proportional to 2,015.92, 2,782.56 and 1,317.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.92 : 2,782.56 = 1,317.40 : x
2. Step 2: Convert to fraction form
   2,015.92/2,782.56 = 1,317.40/x
3. Step 3: Cross multiply
   2,015.92x = 2,782.56 × 1,317.40
4. Step 4: Simplify right side
   2,015.92x = 3,665,744.54
5. Step 5: Solve for x
   x = 3,665,744.54/2,015.92
6. Step 6: Final answer
   x = 1,818.40