Finding the Fourth Proportional to 2,391.72, 3,299.78 and 1,447.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.72 : 3,299.78 = 1,447.80 : x
2. Step 2: Convert to fraction form
   2,391.72/3,299.78 = 1,447.80/x
3. Step 3: Cross multiply
   2,391.72x = 3,299.78 × 1,447.80
4. Step 4: Simplify right side
   2,391.72x = 4,777,414.25
5. Step 5: Solve for x
   x = 4,777,414.25/2,391.72
6. Step 6: Final answer
   x = 1,997.48