Finding the Fourth Proportional to 2,500.91, 3,751.90 and 857.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,500.91 : 3,751.90 = 857.02 : x
2. Step 2: Convert to fraction form
   2,500.91/3,751.90 = 857.02/x
3. Step 3: Cross multiply
   2,500.91x = 3,751.90 × 857.02
4. Step 4: Simplify right side
   2,500.91x = 3,215,441.82
5. Step 5: Solve for x
   x = 3,215,441.82/2,500.91
6. Step 6: Final answer
   x = 1,285.71