Finding the Fourth Proportional to 2,628.10, 3,942.78 and 873.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.10 : 3,942.78 = 873.70 : x
2. Step 2: Convert to fraction form
   2,628.10/3,942.78 = 873.70/x
3. Step 3: Cross multiply
   2,628.10x = 3,942.78 × 873.70
4. Step 4: Simplify right side
   2,628.10x = 3,444,806.89
5. Step 5: Solve for x
   x = 3,444,806.89/2,628.10
6. Step 6: Final answer
   x = 1,310.76