Finding the Fourth Proportional to 1,128.36, 1,556.42 and 814.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.36 : 1,556.42 = 814.43 : x
2. Step 2: Convert to fraction form
   1,128.36/1,556.42 = 814.43/x
3. Step 3: Cross multiply
   1,128.36x = 1,556.42 × 814.43
4. Step 4: Simplify right side
   1,128.36x = 1,267,590.58
5. Step 5: Solve for x
   x = 1,267,590.58/1,128.36
6. Step 6: Final answer
   x = 1,123.40