Finding the Fourth Proportional to 2,087.28, 2,893.50 and 2,005.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.28 : 2,893.50 = 2,005.20 : x
2. Step 2: Convert to fraction form
   2,087.28/2,893.50 = 2,005.20/x
3. Step 3: Cross multiply
   2,087.28x = 2,893.50 × 2,005.20
4. Step 4: Simplify right side
   2,087.28x = 5,802,046.20
5. Step 5: Solve for x
   x = 5,802,046.20/2,087.28
6. Step 6: Final answer
   x = 2,779.72