Finding the Fourth Proportional to 2,443.78, 3,665.16 and 712

Step by Step Solution

1. Step 1: Write the proportion equation
   2,443.78 : 3,665.16 = 712 : x
2. Step 2: Convert to fraction form
   2,443.78/3,665.16 = 712/x
3. Step 3: Cross multiply
   2,443.78x = 3,665.16 × 712
4. Step 4: Simplify right side
   2,443.78x = 2,609,593.92
5. Step 5: Solve for x
   x = 2,609,593.92/2,443.78
6. Step 6: Final answer
   x = 1,067.85