Finding the Fourth Proportional to 2,543.25, 3,815.52 and 811.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,543.25 : 3,815.52 = 811.89 : x
2. Step 2: Convert to fraction form
   2,543.25/3,815.52 = 811.89/x
3. Step 3: Cross multiply
   2,543.25x = 3,815.52 × 811.89
4. Step 4: Simplify right side
   2,543.25x = 3,097,782.53
5. Step 5: Solve for x
   x = 3,097,782.53/2,543.25
6. Step 6: Final answer
   x = 1,218.04