Finding the Fourth Proportional to 1,208.53, 1,667.78 and 684.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.53 : 1,667.78 = 684.56 : x
2. Step 2: Convert to fraction form
   1,208.53/1,667.78 = 684.56/x
3. Step 3: Cross multiply
   1,208.53x = 1,667.78 × 684.56
4. Step 4: Simplify right side
   1,208.53x = 1,141,698.79
5. Step 5: Solve for x
   x = 1,141,698.79/1,208.53
6. Step 6: Final answer
   x = 944.70