Finding the Fourth Proportional to 2,010.49, 3,013.31 and 853.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,010.49 : 3,013.31 = 853.81 : x
2. Step 2: Convert to fraction form
   2,010.49/3,013.31 = 853.81/x
3. Step 3: Cross multiply
   2,010.49x = 3,013.31 × 853.81
4. Step 4: Simplify right side
   2,010.49x = 2,572,794.21
5. Step 5: Solve for x
   x = 2,572,794.21/2,010.49
6. Step 6: Final answer
   x = 1,279.69