Finding the Fourth Proportional to 1,208.39, 1,667.75 and 711.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.39 : 1,667.75 = 711.18 : x
2. Step 2: Convert to fraction form
   1,208.39/1,667.75 = 711.18/x
3. Step 3: Cross multiply
   1,208.39x = 1,667.75 × 711.18
4. Step 4: Simplify right side
   1,208.39x = 1,186,066.89
5. Step 5: Solve for x
   x = 1,186,066.89/1,208.39
6. Step 6: Final answer
   x = 981.53