Finding the Fourth Proportional to 2,085.12, 3,125.49 and 698.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.12 : 3,125.49 = 698.10 : x
2. Step 2: Convert to fraction form
   2,085.12/3,125.49 = 698.10/x
3. Step 3: Cross multiply
   2,085.12x = 3,125.49 × 698.10
4. Step 4: Simplify right side
   2,085.12x = 2,181,904.57
5. Step 5: Solve for x
   x = 2,181,904.57/2,085.12
6. Step 6: Final answer
   x = 1,046.42