Finding the Fourth Proportional to 1,208.18, 1,667.40 and 711.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.18 : 1,667.40 = 711.02 : x
2. Step 2: Convert to fraction form
   1,208.18/1,667.40 = 711.02/x
3. Step 3: Cross multiply
   1,208.18x = 1,667.40 × 711.02
4. Step 4: Simplify right side
   1,208.18x = 1,185,554.75
5. Step 5: Solve for x
   x = 1,185,554.75/1,208.18
6. Step 6: Final answer
   x = 981.27