Finding the Fourth Proportional to 1,127.25, 1,555.61 and 685.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.25 : 1,555.61 = 685.07 : x
2. Step 2: Convert to fraction form
   1,127.25/1,555.61 = 685.07/x
3. Step 3: Cross multiply
   1,127.25x = 1,555.61 × 685.07
4. Step 4: Simplify right side
   1,127.25x = 1,065,696.37
5. Step 5: Solve for x
   x = 1,065,696.37/1,127.25
6. Step 6: Final answer
   x = 945.39