Finding the Fourth Proportional to 2,499.88, 3,747.31 and 855.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.88 : 3,747.31 = 855.30 : x
2. Step 2: Convert to fraction form
   2,499.88/3,747.31 = 855.30/x
3. Step 3: Cross multiply
   2,499.88x = 3,747.31 × 855.30
4. Step 4: Simplify right side
   2,499.88x = 3,205,074.24
5. Step 5: Solve for x
   x = 3,205,074.24/2,499.88
6. Step 6: Final answer
   x = 1,282.09