Finding the Fourth Proportional to 2,628.47, 3,942.91 and 873.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.47 : 3,942.91 = 873.40 : x
2. Step 2: Convert to fraction form
   2,628.47/3,942.91 = 873.40/x
3. Step 3: Cross multiply
   2,628.47x = 3,942.91 × 873.40
4. Step 4: Simplify right side
   2,628.47x = 3,443,737.59
5. Step 5: Solve for x
   x = 3,443,737.59/2,628.47
6. Step 6: Final answer
   x = 1,310.17