Finding the Fourth Proportional to 1,216.83, 1,679.27 and 685.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.83 : 1,679.27 = 685.92 : x
2. Step 2: Convert to fraction form
   1,216.83/1,679.27 = 685.92/x
3. Step 3: Cross multiply
   1,216.83x = 1,679.27 × 685.92
4. Step 4: Simplify right side
   1,216.83x = 1,151,839.35
5. Step 5: Solve for x
   x = 1,151,839.35/1,216.83
6. Step 6: Final answer
   x = 946.59