Finding the Fourth Proportional to 2,578.53, 3,866.06 and 1,191.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.53 : 3,866.06 = 1,191.11 : x
2. Step 2: Convert to fraction form
   2,578.53/3,866.06 = 1,191.11/x
3. Step 3: Cross multiply
   2,578.53x = 3,866.06 × 1,191.11
4. Step 4: Simplify right side
   2,578.53x = 4,604,883.40
5. Step 5: Solve for x
   x = 4,604,883.40/2,578.53
6. Step 6: Final answer
   x = 1,785.86