Finding the Fourth Proportional to 2,271.78, 3,407.94 and 811.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,271.78 : 3,407.94 = 811.08 : x
2. Step 2: Convert to fraction form
   2,271.78/3,407.94 = 811.08/x
3. Step 3: Cross multiply
   2,271.78x = 3,407.94 × 811.08
4. Step 4: Simplify right side
   2,271.78x = 2,764,111.98
5. Step 5: Solve for x
   x = 2,764,111.98/2,271.78
6. Step 6: Final answer
   x = 1,216.72