Finding the Fourth Proportional to 2,084.91, 3,128.90 and 989.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,084.91 : 3,128.90 = 989.27 : x
2. Step 2: Convert to fraction form
   2,084.91/3,128.90 = 989.27/x
3. Step 3: Cross multiply
   2,084.91x = 3,128.90 × 989.27
4. Step 4: Simplify right side
   2,084.91x = 3,095,326.85
5. Step 5: Solve for x
   x = 3,095,326.85/2,084.91
6. Step 6: Final answer
   x = 1,484.64