Finding the Fourth Proportional to 2,801.56, 4,201.12 and 853.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,801.56 : 4,201.12 = 853.31 : x
2. Step 2: Convert to fraction form
   2,801.56/4,201.12 = 853.31/x
3. Step 3: Cross multiply
   2,801.56x = 4,201.12 × 853.31
4. Step 4: Simplify right side
   2,801.56x = 3,584,857.71
5. Step 5: Solve for x
   x = 3,584,857.71/2,801.56
6. Step 6: Final answer
   x = 1,279.59