Finding the Fourth Proportional to 1,425.06, 2,137.89 and 809.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.06 : 2,137.89 = 809.05 : x
2. Step 2: Convert to fraction form
   1,425.06/2,137.89 = 809.05/x
3. Step 3: Cross multiply
   1,425.06x = 2,137.89 × 809.05
4. Step 4: Simplify right side
   1,425.06x = 1,729,659.90
5. Step 5: Solve for x
   x = 1,729,659.90/1,425.06
6. Step 6: Final answer
   x = 1,213.75