Finding the Fourth Proportional to 2,578.67, 3,867.55 and 1,191.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.67 : 3,867.55 = 1,191.89 : x
2. Step 2: Convert to fraction form
   2,578.67/3,867.55 = 1,191.89/x
3. Step 3: Cross multiply
   2,578.67x = 3,867.55 × 1,191.89
4. Step 4: Simplify right side
   2,578.67x = 4,609,694.17
5. Step 5: Solve for x
   x = 4,609,694.17/2,578.67
6. Step 6: Final answer
   x = 1,787.62