Finding the Fourth Proportional to 2,131.24, 3,196.36 and 814.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.24 : 3,196.36 = 814.72 : x
2. Step 2: Convert to fraction form
   2,131.24/3,196.36 = 814.72/x
3. Step 3: Cross multiply
   2,131.24x = 3,196.36 × 814.72
4. Step 4: Simplify right side
   2,131.24x = 2,604,138.42
5. Step 5: Solve for x
   x = 2,604,138.42/2,131.24
6. Step 6: Final answer
   x = 1,221.89