Finding the Fourth Proportional to 1,604.17, 2,213.81 and 905.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,604.17 : 2,213.81 = 905.59 : x
2. Step 2: Convert to fraction form
   1,604.17/2,213.81 = 905.59/x
3. Step 3: Cross multiply
   1,604.17x = 2,213.81 × 905.59
4. Step 4: Simplify right side
   1,604.17x = 2,004,804.20
5. Step 5: Solve for x
   x = 2,004,804.20/1,604.17
6. Step 6: Final answer
   x = 1,249.75