Finding the Fourth Proportional to 1,685.63, 2,325.90 and 939.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,685.63 : 2,325.90 = 939.57 : x
2. Step 2: Convert to fraction form
   1,685.63/2,325.90 = 939.57/x
3. Step 3: Cross multiply
   1,685.63x = 2,325.90 × 939.57
4. Step 4: Simplify right side
   1,685.63x = 2,185,345.86
5. Step 5: Solve for x
   x = 2,185,345.86/1,685.63
6. Step 6: Final answer
   x = 1,296.46