Finding the Fourth Proportional to 1,208.84, 1,667.98 and 711.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.84 : 1,667.98 = 711.57 : x
2. Step 2: Convert to fraction form
   1,208.84/1,667.98 = 711.57/x
3. Step 3: Cross multiply
   1,208.84x = 1,667.98 × 711.57
4. Step 4: Simplify right side
   1,208.84x = 1,186,884.53
5. Step 5: Solve for x
   x = 1,186,884.53/1,208.84
6. Step 6: Final answer
   x = 981.84