Finding the Fourth Proportional to 1,686.04, 2,326.73 and 939.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.04 : 2,326.73 = 939.89 : x
2. Step 2: Convert to fraction form
   1,686.04/2,326.73 = 939.89/x
3. Step 3: Cross multiply
   1,686.04x = 2,326.73 × 939.89
4. Step 4: Simplify right side
   1,686.04x = 2,186,871.38
5. Step 5: Solve for x
   x = 2,186,871.38/1,686.04
6. Step 6: Final answer
   x = 1,297.05