Finding the Fourth Proportional to 2,657.12, 3,984.12 and 1,013.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,657.12 : 3,984.12 = 1,013.78 : x
2. Step 2: Convert to fraction form
   2,657.12/3,984.12 = 1,013.78/x
3. Step 3: Cross multiply
   2,657.12x = 3,984.12 × 1,013.78
4. Step 4: Simplify right side
   2,657.12x = 4,039,021.17
5. Step 5: Solve for x
   x = 4,039,021.17/2,657.12
6. Step 6: Final answer
   x = 1,520.07