Finding the Fourth Proportional to 1,208.34, 1,667.78 and 684.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.34 : 1,667.78 = 684.68 : x
2. Step 2: Convert to fraction form
   1,208.34/1,667.78 = 684.68/x
3. Step 3: Cross multiply
   1,208.34x = 1,667.78 × 684.68
4. Step 4: Simplify right side
   1,208.34x = 1,141,895.61
5. Step 5: Solve for x
   x = 1,141,895.61/1,208.34
6. Step 6: Final answer
   x = 945.01