Finding the Fourth Proportional to 1,127.37, 1,555.83 and 685.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.37 : 1,555.83 = 685.20 : x
2. Step 2: Convert to fraction form
   1,127.37/1,555.83 = 685.20/x
3. Step 3: Cross multiply
   1,127.37x = 1,555.83 × 685.20
4. Step 4: Simplify right side
   1,127.37x = 1,066,054.72
5. Step 5: Solve for x
   x = 1,066,054.72/1,127.37
6. Step 6: Final answer
   x = 945.61