Finding the Fourth Proportional to 2,499.88, 3,749.64 and 855.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.88 : 3,749.64 = 855.76 : x
2. Step 2: Convert to fraction form
   2,499.88/3,749.64 = 855.76/x
3. Step 3: Cross multiply
   2,499.88x = 3,749.64 × 855.76
4. Step 4: Simplify right side
   2,499.88x = 3,208,791.93
5. Step 5: Solve for x
   x = 3,208,791.93/2,499.88
6. Step 6: Final answer
   x = 1,283.58