Finding the Fourth Proportional to 1,631.86, 2,444.34 and 809.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,631.86 : 2,444.34 = 809.57 : x
2. Step 2: Convert to fraction form
   1,631.86/2,444.34 = 809.57/x
3. Step 3: Cross multiply
   1,631.86x = 2,444.34 × 809.57
4. Step 4: Simplify right side
   1,631.86x = 1,978,864.33
5. Step 5: Solve for x
   x = 1,978,864.33/1,631.86
6. Step 6: Final answer
   x = 1,212.64