Finding the Fourth Proportional to 2,568.47, 3,853.23 and 813.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,568.47 : 3,853.23 = 813.93 : x
2. Step 2: Convert to fraction form
   2,568.47/3,853.23 = 813.93/x
3. Step 3: Cross multiply
   2,568.47x = 3,853.23 × 813.93
4. Step 4: Simplify right side
   2,568.47x = 3,136,259.49
5. Step 5: Solve for x
   x = 3,136,259.49/2,568.47
6. Step 6: Final answer
   x = 1,221.06