Finding the Fourth Proportional to 2,085.95, 3,128.63 and 699.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.95 : 3,128.63 = 699.23 : x
2. Step 2: Convert to fraction form
   2,085.95/3,128.63 = 699.23/x
3. Step 3: Cross multiply
   2,085.95x = 3,128.63 × 699.23
4. Step 4: Simplify right side
   2,085.95x = 2,187,636.28
5. Step 5: Solve for x
   x = 2,187,636.28/2,085.95
6. Step 6: Final answer
   x = 1,048.75