Finding the Fourth Proportional to 1,369.31, 1,890.34 and 809.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.31 : 1,890.34 = 809.93 : x
2. Step 2: Convert to fraction form
   1,369.31/1,890.34 = 809.93/x
3. Step 3: Cross multiply
   1,369.31x = 1,890.34 × 809.93
4. Step 4: Simplify right side
   1,369.31x = 1,531,045.78
5. Step 5: Solve for x
   x = 1,531,045.78/1,369.31
6. Step 6: Final answer
   x = 1,118.12