Finding the Fourth Proportional to 2,604.78, 3,906.72 and 873.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,604.78 : 3,906.72 = 873.40 : x
2. Step 2: Convert to fraction form
   2,604.78/3,906.72 = 873.40/x
3. Step 3: Cross multiply
   2,604.78x = 3,906.72 × 873.40
4. Step 4: Simplify right side
   2,604.78x = 3,412,129.25
5. Step 5: Solve for x
   x = 3,412,129.25/2,604.78
6. Step 6: Final answer
   x = 1,309.95