Finding the Fourth Proportional to 2,500.45, 3,751.31 and 857.00

Step by Step Solution

1. Step 1: Write the proportion equation
   2,500.45 : 3,751.31 = 857.00 : x
2. Step 2: Convert to fraction form
   2,500.45/3,751.31 = 857.00/x
3. Step 3: Cross multiply
   2,500.45x = 3,751.31 × 857.00
4. Step 4: Simplify right side
   2,500.45x = 3,214,884.19
5. Step 5: Solve for x
   x = 3,214,884.19/2,500.45
6. Step 6: Final answer
   x = 1,285.72