Finding the Fourth Proportional to 2,113.29, 3,171.15 and 814.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.29 : 3,171.15 = 814.86 : x
2. Step 2: Convert to fraction form
   2,113.29/3,171.15 = 814.86/x
3. Step 3: Cross multiply
   2,113.29x = 3,171.15 × 814.86
4. Step 4: Simplify right side
   2,113.29x = 2,584,043.29
5. Step 5: Solve for x
   x = 2,584,043.29/2,113.29
6. Step 6: Final answer
   x = 1,222.76