Finding the Fourth Proportional to 1,127.56, 1,556.16 and 685.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.56 : 1,556.16 = 685.42 : x
2. Step 2: Convert to fraction form
   1,127.56/1,556.16 = 685.42/x
3. Step 3: Cross multiply
   1,127.56x = 1,556.16 × 685.42
4. Step 4: Simplify right side
   1,127.56x = 1,066,623.19
5. Step 5: Solve for x
   x = 1,066,623.19/1,127.56
6. Step 6: Final answer
   x = 945.96