Finding the Fourth Proportional to 2,085.24, 3,128.34 and 698.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.24 : 3,128.34 = 698.58 : x
2. Step 2: Convert to fraction form
   2,085.24/3,128.34 = 698.58/x
3. Step 3: Cross multiply
   2,085.24x = 3,128.34 × 698.58
4. Step 4: Simplify right side
   2,085.24x = 2,185,395.76
5. Step 5: Solve for x
   x = 2,185,395.76/2,085.24
6. Step 6: Final answer
   x = 1,048.03