Finding the Fourth Proportional to 2,015.37, 3,021.80 and 698.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.37 : 3,021.80 = 698.81 : x
2. Step 2: Convert to fraction form
   2,015.37/3,021.80 = 698.81/x
3. Step 3: Cross multiply
   2,015.37x = 3,021.80 × 698.81
4. Step 4: Simplify right side
   2,015.37x = 2,111,664.06
5. Step 5: Solve for x
   x = 2,111,664.06/2,015.37
6. Step 6: Final answer
   x = 1,047.78