Finding the Fourth Proportional to 2,604.12, 3,906.72 and 872.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,604.12 : 3,906.72 = 872.88 : x
2. Step 2: Convert to fraction form
   2,604.12/3,906.72 = 872.88/x
3. Step 3: Cross multiply
   2,604.12x = 3,906.72 × 872.88
4. Step 4: Simplify right side
   2,604.12x = 3,410,097.75
5. Step 5: Solve for x
   x = 3,410,097.75/2,604.12
6. Step 6: Final answer
   x = 1,309.50