Finding the Fourth Proportional to 2,085.59, 3,128.43 and 698.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.59 : 3,128.43 = 698.67 : x
2. Step 2: Convert to fraction form
   2,085.59/3,128.43 = 698.67/x
3. Step 3: Cross multiply
   2,085.59x = 3,128.43 × 698.67
4. Step 4: Simplify right side
   2,085.59x = 2,185,744.74
5. Step 5: Solve for x
   x = 2,185,744.74/2,085.59
6. Step 6: Final answer
   x = 1,048.02