Finding the Fourth Proportional to 2,082.21, 3,123.05 and 987.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.21 : 3,123.05 = 987.27 : x
2. Step 2: Convert to fraction form
   2,082.21/3,123.05 = 987.27/x
3. Step 3: Cross multiply
   2,082.21x = 3,123.05 × 987.27
4. Step 4: Simplify right side
   2,082.21x = 3,083,288.64
5. Step 5: Solve for x
   x = 3,083,288.64/2,082.21
6. Step 6: Final answer
   x = 1,480.78