Finding the Fourth Proportional to 3,391.28, 5,086.86 and 1,082.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,391.28 : 5,086.86 = 1,082.78 : x
2. Step 2: Convert to fraction form
   3,391.28/5,086.86 = 1,082.78/x
3. Step 3: Cross multiply
   3,391.28x = 5,086.86 × 1,082.78
4. Step 4: Simplify right side
   3,391.28x = 5,507,950.27
5. Step 5: Solve for x
   x = 5,507,950.27/3,391.28
6. Step 6: Final answer
   x = 1,624.15