Finding the Fourth Proportional to 2,086.12, 3,127.74 and 989.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.12 : 3,127.74 = 989.56 : x
2. Step 2: Convert to fraction form
   2,086.12/3,127.74 = 989.56/x
3. Step 3: Cross multiply
   2,086.12x = 3,127.74 × 989.56
4. Step 4: Simplify right side
   2,086.12x = 3,095,086.39
5. Step 5: Solve for x
   x = 3,095,086.39/2,086.12
6. Step 6: Final answer
   x = 1,483.66