Finding the Fourth Proportional to 2,015.36, 3,022.28 and 698.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.36 : 3,022.28 = 698.78 : x
2. Step 2: Convert to fraction form
   2,015.36/3,022.28 = 698.78/x
3. Step 3: Cross multiply
   2,015.36x = 3,022.28 × 698.78
4. Step 4: Simplify right side
   2,015.36x = 2,111,908.82
5. Step 5: Solve for x
   x = 2,111,908.82/2,015.36
6. Step 6: Final answer
   x = 1,047.91