Finding the Fourth Proportional to 1,685.57, 2,326.05 and 939.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,685.57 : 2,326.05 = 939.49 : x
2. Step 2: Convert to fraction form
   1,685.57/2,326.05 = 939.49/x
3. Step 3: Cross multiply
   1,685.57x = 2,326.05 × 939.49
4. Step 4: Simplify right side
   1,685.57x = 2,185,300.71
5. Step 5: Solve for x
   x = 2,185,300.71/1,685.57
6. Step 6: Final answer
   x = 1,296.48