Finding the Fourth Proportional to 1,208.72, 1,667.94 and 684.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.72 : 1,667.94 = 684.80 : x
2. Step 2: Convert to fraction form
   1,208.72/1,667.94 = 684.80/x
3. Step 3: Cross multiply
   1,208.72x = 1,667.94 × 684.80
4. Step 4: Simplify right side
   1,208.72x = 1,142,205.31
5. Step 5: Solve for x
   x = 1,142,205.31/1,208.72
6. Step 6: Final answer
   x = 944.97