Finding the Fourth Proportional to 2,084.77, 3,128.69 and 989.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,084.77 : 3,128.69 = 989.14 : x
2. Step 2: Convert to fraction form
   2,084.77/3,128.69 = 989.14/x
3. Step 3: Cross multiply
   2,084.77x = 3,128.69 × 989.14
4. Step 4: Simplify right side
   2,084.77x = 3,094,712.43
5. Step 5: Solve for x
   x = 3,094,712.43/2,084.77
6. Step 6: Final answer
   x = 1,484.44