Finding the Fourth Proportional to 1,604.30, 2,213.82 and 905.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,604.30 : 2,213.82 = 905.63 : x
2. Step 2: Convert to fraction form
   1,604.30/2,213.82 = 905.63/x
3. Step 3: Cross multiply
   1,604.30x = 2,213.82 × 905.63
4. Step 4: Simplify right side
   1,604.30x = 2,004,890.74
5. Step 5: Solve for x
   x = 2,004,890.74/1,604.30
6. Step 6: Final answer
   x = 1,249.70