Finding the Fourth Proportional to 2,580.56, 3,867.71 and 1,191

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.56 : 3,867.71 = 1,191 : x
2. Step 2: Convert to fraction form
   2,580.56/3,867.71 = 1,191/x
3. Step 3: Cross multiply
   2,580.56x = 3,867.71 × 1,191
4. Step 4: Simplify right side
   2,580.56x = 4,606,436.66
5. Step 5: Solve for x
   x = 4,606,436.66/2,580.56
6. Step 6: Final answer
   x = 1,785.06