Finding the Fourth Proportional to 3,942.49, 5,913.56 and 980.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,942.49 : 5,913.56 = 980.87 : x
2. Step 2: Convert to fraction form
   3,942.49/5,913.56 = 980.87/x
3. Step 3: Cross multiply
   3,942.49x = 5,913.56 × 980.87
4. Step 4: Simplify right side
   3,942.49x = 5,800,450.83
5. Step 5: Solve for x
   x = 5,800,450.83/3,942.49
6. Step 6: Final answer
   x = 1,471.27