Finding the Fourth Proportional to 1,127.32, 1,555.42 and 685.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.32 : 1,555.42 = 685.19 : x
2. Step 2: Convert to fraction form
   1,127.32/1,555.42 = 685.19/x
3. Step 3: Cross multiply
   1,127.32x = 1,555.42 × 685.19
4. Step 4: Simplify right side
   1,127.32x = 1,065,758.23
5. Step 5: Solve for x
   x = 1,065,758.23/1,127.32
6. Step 6: Final answer
   x = 945.39