Finding the Fourth Proportional to 2,647.92, 3,969.09 and 1,087.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.92 : 3,969.09 = 1,087.23 : x
2. Step 2: Convert to fraction form
   2,647.92/3,969.09 = 1,087.23/x
3. Step 3: Cross multiply
   2,647.92x = 3,969.09 × 1,087.23
4. Step 4: Simplify right side
   2,647.92x = 4,315,313.72
5. Step 5: Solve for x
   x = 4,315,313.72/2,647.92
6. Step 6: Final answer
   x = 1,629.70