Finding the Fourth Proportional to 1,208.58, 1,667.94 and 684.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.58 : 1,667.94 = 684.63 : x
2. Step 2: Convert to fraction form
   1,208.58/1,667.94 = 684.63/x
3. Step 3: Cross multiply
   1,208.58x = 1,667.94 × 684.63
4. Step 4: Simplify right side
   1,208.58x = 1,141,921.76
5. Step 5: Solve for x
   x = 1,141,921.76/1,208.58
6. Step 6: Final answer
   x = 944.85