Finding the Fourth Proportional to 2,085.47, 3,128.56 and 989.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.47 : 3,128.56 = 989.24 : x
2. Step 2: Convert to fraction form
   2,085.47/3,128.56 = 989.24/x
3. Step 3: Cross multiply
   2,085.47x = 3,128.56 × 989.24
4. Step 4: Simplify right side
   2,085.47x = 3,094,891.78
5. Step 5: Solve for x
   x = 3,094,891.78/2,085.47
6. Step 6: Final answer
   x = 1,484.02