Finding the Fourth Proportional to 1,685.89, 2,326.53 and 939.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,685.89 : 2,326.53 = 939.85 : x
2. Step 2: Convert to fraction form
   1,685.89/2,326.53 = 939.85/x
3. Step 3: Cross multiply
   1,685.89x = 2,326.53 × 939.85
4. Step 4: Simplify right side
   1,685.89x = 2,186,589.22
5. Step 5: Solve for x
   x = 2,186,589.22/1,685.89
6. Step 6: Final answer
   x = 1,296.99