Finding the Fourth Proportional to 2,112.76, 3,169.86 and 814.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.76 : 3,169.86 = 814.42 : x
2. Step 2: Convert to fraction form
   2,112.76/3,169.86 = 814.42/x
3. Step 3: Cross multiply
   2,112.76x = 3,169.86 × 814.42
4. Step 4: Simplify right side
   2,112.76x = 2,581,597.38
5. Step 5: Solve for x
   x = 2,581,597.38/2,112.76
6. Step 6: Final answer
   x = 1,221.91