Finding the Fourth Proportional to 2,543.69, 3,815.42 and 788.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,543.69 : 3,815.42 = 788.55 : x
2. Step 2: Convert to fraction form
   2,543.69/3,815.42 = 788.55/x
3. Step 3: Cross multiply
   2,543.69x = 3,815.42 × 788.55
4. Step 4: Simplify right side
   2,543.69x = 3,008,645.50
5. Step 5: Solve for x
   x = 3,008,645.50/2,543.69
6. Step 6: Final answer
   x = 1,182.79