Finding the Fourth Proportional to 1,127.27, 1,555.17 and 685.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.27 : 1,555.17 = 685.10 : x
2. Step 2: Convert to fraction form
   1,127.27/1,555.17 = 685.10/x
3. Step 3: Cross multiply
   1,127.27x = 1,555.17 × 685.10
4. Step 4: Simplify right side
   1,127.27x = 1,065,446.97
5. Step 5: Solve for x
   x = 1,065,446.97/1,127.27
6. Step 6: Final answer
   x = 945.16