Finding the Fourth Proportional to 1,245.37, 1,718.58 and 685.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.37 : 1,718.58 = 685.83 : x
2. Step 2: Convert to fraction form
   1,245.37/1,718.58 = 685.83/x
3. Step 3: Cross multiply
   1,245.37x = 1,718.58 × 685.83
4. Step 4: Simplify right side
   1,245.37x = 1,178,648.24
5. Step 5: Solve for x
   x = 1,178,648.24/1,245.37
6. Step 6: Final answer
   x = 946.43