Finding the Fourth Proportional to 2,499.78, 3,749.01 and 744.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.78 : 3,749.01 = 744.31 : x
2. Step 2: Convert to fraction form
   2,499.78/3,749.01 = 744.31/x
3. Step 3: Cross multiply
   2,499.78x = 3,749.01 × 744.31
4. Step 4: Simplify right side
   2,499.78x = 2,790,425.63
5. Step 5: Solve for x
   x = 2,790,425.63/2,499.78
6. Step 6: Final answer
   x = 1,116.27