Finding the Fourth Proportional to 1,208.65, 1,667.89 and 684.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.65 : 1,667.89 = 684.70 : x
2. Step 2: Convert to fraction form
   1,208.65/1,667.89 = 684.70/x
3. Step 3: Cross multiply
   1,208.65x = 1,667.89 × 684.70
4. Step 4: Simplify right side
   1,208.65x = 1,142,004.28
5. Step 5: Solve for x
   x = 1,142,004.28/1,208.65
6. Step 6: Final answer
   x = 944.86