Finding the Fourth Proportional to 2,131.20, 3,196.81 and 814.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.20 : 3,196.81 = 814.59 : x
2. Step 2: Convert to fraction form
   2,131.20/3,196.81 = 814.59/x
3. Step 3: Cross multiply
   2,131.20x = 3,196.81 × 814.59
4. Step 4: Simplify right side
   2,131.20x = 2,604,102.46
5. Step 5: Solve for x
   x = 2,604,102.46/2,131.20
6. Step 6: Final answer
   x = 1,221.90