Finding the Fourth Proportional to 2,544.85, 3,817.34 and 813.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,544.85 : 3,817.34 = 813.47 : x
2. Step 2: Convert to fraction form
   2,544.85/3,817.34 = 813.47/x
3. Step 3: Cross multiply
   2,544.85x = 3,817.34 × 813.47
4. Step 4: Simplify right side
   2,544.85x = 3,105,303.15
5. Step 5: Solve for x
   x = 3,105,303.15/2,544.85
6. Step 6: Final answer
   x = 1,220.23