Finding the Fourth Proportional to 2,271.21, 3,407.27 and 810.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,271.21 : 3,407.27 = 810.18 : x
2. Step 2: Convert to fraction form
   2,271.21/3,407.27 = 810.18/x
3. Step 3: Cross multiply
   2,271.21x = 3,407.27 × 810.18
4. Step 4: Simplify right side
   2,271.21x = 2,760,502.01
5. Step 5: Solve for x
   x = 2,760,502.01/2,271.21
6. Step 6: Final answer
   x = 1,215.43