Finding the Fourth Proportional to 1,208.39, 1,667.54 and 853.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.39 : 1,667.54 = 853.94 : x
2. Step 2: Convert to fraction form
   1,208.39/1,667.54 = 853.94/x
3. Step 3: Cross multiply
   1,208.39x = 1,667.54 × 853.94
4. Step 4: Simplify right side
   1,208.39x = 1,423,966.50
5. Step 5: Solve for x
   x = 1,423,966.50/1,208.39
6. Step 6: Final answer
   x = 1,178.40