Finding the Fourth Proportional to 1,384.62, 1,910.82 and 853.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.62 : 1,910.82 = 853.39 : x
2. Step 2: Convert to fraction form
   1,384.62/1,910.82 = 853.39/x
3. Step 3: Cross multiply
   1,384.62x = 1,910.82 × 853.39
4. Step 4: Simplify right side
   1,384.62x = 1,630,674.68
5. Step 5: Solve for x
   x = 1,630,674.68/1,384.62
6. Step 6: Final answer
   x = 1,177.71