Finding the Fourth Proportional to 2,196.50, 3,296.05 and 810.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.50 : 3,296.05 = 810.81 : x
2. Step 2: Convert to fraction form
   2,196.50/3,296.05 = 810.81/x
3. Step 3: Cross multiply
   2,196.50x = 3,296.05 × 810.81
4. Step 4: Simplify right side
   2,196.50x = 2,672,470.30
5. Step 5: Solve for x
   x = 2,672,470.30/2,196.50
6. Step 6: Final answer
   x = 1,216.69