Finding the Fourth Proportional to 1,286.83, 1,775.89 and 814.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,286.83 : 1,775.89 = 814.55 : x
2. Step 2: Convert to fraction form
   1,286.83/1,775.89 = 814.55/x
3. Step 3: Cross multiply
   1,286.83x = 1,775.89 × 814.55
4. Step 4: Simplify right side
   1,286.83x = 1,446,553.27
5. Step 5: Solve for x
   x = 1,446,553.27/1,286.83
6. Step 6: Final answer
   x = 1,124.12