Finding the Fourth Proportional to 1,208.43, 1,667.34 and 711.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.43 : 1,667.34 = 711.09 : x
2. Step 2: Convert to fraction form
   1,208.43/1,667.34 = 711.09/x
3. Step 3: Cross multiply
   1,208.43x = 1,667.34 × 711.09
4. Step 4: Simplify right side
   1,208.43x = 1,185,628.80
5. Step 5: Solve for x
   x = 1,185,628.80/1,208.43
6. Step 6: Final answer
   x = 981.13