Finding the Fourth Proportional to 2,801.39, 4,202.12 and 853.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,801.39 : 4,202.12 = 853.61 : x
2. Step 2: Convert to fraction form
   2,801.39/4,202.12 = 853.61/x
3. Step 3: Cross multiply
   2,801.39x = 4,202.12 × 853.61
4. Step 4: Simplify right side
   2,801.39x = 3,586,952.78
5. Step 5: Solve for x
   x = 3,586,952.78/2,801.39
6. Step 6: Final answer
   x = 1,280.42