Finding the Fourth Proportional to 1,208.69, 1,667.96 and 711.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.69 : 1,667.96 = 711.35 : x
2. Step 2: Convert to fraction form
   1,208.69/1,667.96 = 711.35/x
3. Step 3: Cross multiply
   1,208.69x = 1,667.96 × 711.35
4. Step 4: Simplify right side
   1,208.69x = 1,186,500.37
5. Step 5: Solve for x
   x = 1,186,500.37/1,208.69
6. Step 6: Final answer
   x = 981.64