Finding the Fourth Proportional to 1,630.78, 2,444.27 and 809.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,630.78 : 2,444.27 = 809.57 : x
2. Step 2: Convert to fraction form
   1,630.78/2,444.27 = 809.57/x
3. Step 3: Cross multiply
   1,630.78x = 2,444.27 × 809.57
4. Step 4: Simplify right side
   1,630.78x = 1,978,803.62
5. Step 5: Solve for x
   x = 1,978,803.62/1,630.78
6. Step 6: Final answer
   x = 1,213.41