Finding the Fourth Proportional to 2,543.72, 3,815.94 and 788.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,543.72 : 3,815.94 = 788.88 : x
2. Step 2: Convert to fraction form
   2,543.72/3,815.94 = 788.88/x
3. Step 3: Cross multiply
   2,543.72x = 3,815.94 × 788.88
4. Step 4: Simplify right side
   2,543.72x = 3,010,318.75
5. Step 5: Solve for x
   x = 3,010,318.75/2,543.72
6. Step 6: Final answer
   x = 1,183.43