Finding the Fourth Proportional to 1,208.71, 1,667.91 and 684.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.71 : 1,667.91 = 684.64 : x
2. Step 2: Convert to fraction form
   1,208.71/1,667.91 = 684.64/x
3. Step 3: Cross multiply
   1,208.71x = 1,667.91 × 684.64
4. Step 4: Simplify right side
   1,208.71x = 1,141,917.90
5. Step 5: Solve for x
   x = 1,141,917.90/1,208.71
6. Step 6: Final answer
   x = 944.74