Finding the Fourth Proportional to 2,499.24, 3,748.74 and 855.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.24 : 3,748.74 = 855.78 : x
2. Step 2: Convert to fraction form
   2,499.24/3,748.74 = 855.78/x
3. Step 3: Cross multiply
   2,499.24x = 3,748.74 × 855.78
4. Step 4: Simplify right side
   2,499.24x = 3,208,096.72
5. Step 5: Solve for x
   x = 3,208,096.72/2,499.24
6. Step 6: Final answer
   x = 1,283.63