Finding the Fourth Proportional to 2,196.76, 3,296.45 and 811.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.76 : 3,296.45 = 811.07 : x
2. Step 2: Convert to fraction form
   2,196.76/3,296.45 = 811.07/x
3. Step 3: Cross multiply
   2,196.76x = 3,296.45 × 811.07
4. Step 4: Simplify right side
   2,196.76x = 2,673,651.70
5. Step 5: Solve for x
   x = 2,673,651.70/2,196.76
6. Step 6: Final answer
   x = 1,217.09