Finding the Fourth Proportional to 2,087.41, 3,131.73 and 990.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.41 : 3,131.73 = 990.27 : x
2. Step 2: Convert to fraction form
   2,087.41/3,131.73 = 990.27/x
3. Step 3: Cross multiply
   2,087.41x = 3,131.73 × 990.27
4. Step 4: Simplify right side
   2,087.41x = 3,101,258.27
5. Step 5: Solve for x
   x = 3,101,258.27/2,087.41
6. Step 6: Final answer
   x = 1,485.70