Finding the Fourth Proportional to 1,208.68, 1,667.94 and 684.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.68 : 1,667.94 = 684.70 : x
2. Step 2: Convert to fraction form
   1,208.68/1,667.94 = 684.70/x
3. Step 3: Cross multiply
   1,208.68x = 1,667.94 × 684.70
4. Step 4: Simplify right side
   1,208.68x = 1,142,038.52
5. Step 5: Solve for x
   x = 1,142,038.52/1,208.68
6. Step 6: Final answer
   x = 944.86