Finding the Fourth Proportional to 2,082.16, 3,120.54 and 986.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.16 : 3,120.54 = 986.86 : x
2. Step 2: Convert to fraction form
   2,082.16/3,120.54 = 986.86/x
3. Step 3: Cross multiply
   2,082.16x = 3,120.54 × 986.86
4. Step 4: Simplify right side
   2,082.16x = 3,079,536.10
5. Step 5: Solve for x
   x = 3,079,536.10/2,082.16
6. Step 6: Final answer
   x = 1,479.01