Finding the Fourth Proportional to 2,085.23, 3,128.25 and 698.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.23 : 3,128.25 = 698.73 : x
2. Step 2: Convert to fraction form
   2,085.23/3,128.25 = 698.73/x
3. Step 3: Cross multiply
   2,085.23x = 3,128.25 × 698.73
4. Step 4: Simplify right side
   2,085.23x = 2,185,802.12
5. Step 5: Solve for x
   x = 2,185,802.12/2,085.23
6. Step 6: Final answer
   x = 1,048.23