Finding the Fourth Proportional to 1,237.89, 1,708.29 and 685.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,237.89 : 1,708.29 = 685.89 : x
2. Step 2: Convert to fraction form
   1,237.89/1,708.29 = 685.89/x
3. Step 3: Cross multiply
   1,237.89x = 1,708.29 × 685.89
4. Step 4: Simplify right side
   1,237.89x = 1,171,699.03
5. Step 5: Solve for x
   x = 1,171,699.03/1,237.89
6. Step 6: Final answer
   x = 946.53