Finding the Fourth Proportional to 2,205.16, 3,305.82 and 905.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,205.16 : 3,305.82 = 905.72 : x
2. Step 2: Convert to fraction form
   2,205.16/3,305.82 = 905.72/x
3. Step 3: Cross multiply
   2,205.16x = 3,305.82 × 905.72
4. Step 4: Simplify right side
   2,205.16x = 2,994,147.29
5. Step 5: Solve for x
   x = 2,994,147.29/2,205.16
6. Step 6: Final answer
   x = 1,357.79