Finding the Fourth Proportional to 1,369.43, 1,889.35 and 809.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.43 : 1,889.35 = 809.92 : x
2. Step 2: Convert to fraction form
   1,369.43/1,889.35 = 809.92/x
3. Step 3: Cross multiply
   1,369.43x = 1,889.35 × 809.92
4. Step 4: Simplify right side
   1,369.43x = 1,530,222.35
5. Step 5: Solve for x
   x = 1,530,222.35/1,369.43
6. Step 6: Final answer
   x = 1,117.42