Finding the Fourth Proportional to 2,643.55, 3,965.49 and 888.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.55 : 3,965.49 = 888.72 : x
2. Step 2: Convert to fraction form
   2,643.55/3,965.49 = 888.72/x
3. Step 3: Cross multiply
   2,643.55x = 3,965.49 × 888.72
4. Step 4: Simplify right side
   2,643.55x = 3,524,210.27
5. Step 5: Solve for x
   x = 3,524,210.27/2,643.55
6. Step 6: Final answer
   x = 1,333.14