Finding the Fourth Proportional to 2,085.41, 3,128.56 and 698.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.41 : 3,128.56 = 698.49 : x
2. Step 2: Convert to fraction form
   2,085.41/3,128.56 = 698.49/x
3. Step 3: Cross multiply
   2,085.41x = 3,128.56 × 698.49
4. Step 4: Simplify right side
   2,085.41x = 2,185,267.87
5. Step 5: Solve for x
   x = 2,185,267.87/2,085.41
6. Step 6: Final answer
   x = 1,047.88