Finding the Fourth Proportional to 2,085.46, 3,128.31 and 698.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.46 : 3,128.31 = 698.74 : x
2. Step 2: Convert to fraction form
   2,085.46/3,128.31 = 698.74/x
3. Step 3: Cross multiply
   2,085.46x = 3,128.31 × 698.74
4. Step 4: Simplify right side
   2,085.46x = 2,185,875.33
5. Step 5: Solve for x
   x = 2,185,875.33/2,085.46
6. Step 6: Final answer
   x = 1,048.15