Finding the Fourth Proportional to 2,015.82, 2,779.48 and 1,891.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.82 : 2,779.48 = 1,891.28 : x
2. Step 2: Convert to fraction form
   2,015.82/2,779.48 = 1,891.28/x
3. Step 3: Cross multiply
   2,015.82x = 2,779.48 × 1,891.28
4. Step 4: Simplify right side
   2,015.82x = 5,256,774.93
5. Step 5: Solve for x
   x = 5,256,774.93/2,015.82
6. Step 6: Final answer
   x = 2,607.76