Finding the Fourth Proportional to 2,103.90, 3,155.05 and 698.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.90 : 3,155.05 = 698.05 : x
2. Step 2: Convert to fraction form
   2,103.90/3,155.05 = 698.05/x
3. Step 3: Cross multiply
   2,103.90x = 3,155.05 × 698.05
4. Step 4: Simplify right side
   2,103.90x = 2,202,387.47
5. Step 5: Solve for x
   x = 2,202,387.47/2,103.90
6. Step 6: Final answer
   x = 1,046.81