Finding the Fourth Proportional to 2,131.49, 3,198.41 and 816.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.49 : 3,198.41 = 816.11 : x
2. Step 2: Convert to fraction form
   2,131.49/3,198.41 = 816.11/x
3. Step 3: Cross multiply
   2,131.49x = 3,198.41 × 816.11
4. Step 4: Simplify right side
   2,131.49x = 2,610,250.30
5. Step 5: Solve for x
   x = 2,610,250.30/2,131.49
6. Step 6: Final answer
   x = 1,224.62