Finding the Fourth Proportional to 2,086.98, 3,130.02 and 853.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.98 : 3,130.02 = 853.18 : x
2. Step 2: Convert to fraction form
   2,086.98/3,130.02 = 853.18/x
3. Step 3: Cross multiply
   2,086.98x = 3,130.02 × 853.18
4. Step 4: Simplify right side
   2,086.98x = 2,670,470.46
5. Step 5: Solve for x
   x = 2,670,470.46/2,086.98
6. Step 6: Final answer
   x = 1,279.59