Finding the Fourth Proportional to 1,208.42, 1,667.61 and 684.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.42 : 1,667.61 = 684.45 : x
2. Step 2: Convert to fraction form
   1,208.42/1,667.61 = 684.45/x
3. Step 3: Cross multiply
   1,208.42x = 1,667.61 × 684.45
4. Step 4: Simplify right side
   1,208.42x = 1,141,395.66
5. Step 5: Solve for x
   x = 1,141,395.66/1,208.42
6. Step 6: Final answer
   x = 944.54