Finding the Fourth Proportional to 1,604.22, 2,213.82 and 905.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,604.22 : 2,213.82 = 905.59 : x
2. Step 2: Convert to fraction form
   1,604.22/2,213.82 = 905.59/x
3. Step 3: Cross multiply
   1,604.22x = 2,213.82 × 905.59
4. Step 4: Simplify right side
   1,604.22x = 2,004,813.25
5. Step 5: Solve for x
   x = 2,004,813.25/1,604.22
6. Step 6: Final answer
   x = 1,249.71