Finding the Fourth Proportional to 2,500.72, 3,751.84 and 857.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,500.72 : 3,751.84 = 857.28 : x
2. Step 2: Convert to fraction form
   2,500.72/3,751.84 = 857.28/x
3. Step 3: Cross multiply
   2,500.72x = 3,751.84 × 857.28
4. Step 4: Simplify right side
   2,500.72x = 3,216,377.40
5. Step 5: Solve for x
   x = 3,216,377.40/2,500.72
6. Step 6: Final answer
   x = 1,286.18