Finding the Fourth Proportional to 2,655, 3,983.94 and 1,287

Step by Step Solution

1. Step 1: Write the proportion equation
   2,655 : 3,983.94 = 1,287 : x
2. Step 2: Convert to fraction form
   2,655/3,983.94 = 1,287/x
3. Step 3: Cross multiply
   2,655x = 3,983.94 × 1,287
4. Step 4: Simplify right side
   2,655x = 5,127,330.78
5. Step 5: Solve for x
   x = 5,127,330.78/2,655
6. Step 6: Final answer
   x = 1,931.20