Finding the Fourth Proportional to 3,919.16, 5,878.78 and 997.47

Step by Step Solution

1. Step 1: Write the proportion equation
   3,919.16 : 5,878.78 = 997.47 : x
2. Step 2: Convert to fraction form
   3,919.16/5,878.78 = 997.47/x
3. Step 3: Cross multiply
   3,919.16x = 5,878.78 × 997.47
4. Step 4: Simplify right side
   3,919.16x = 5,863,906.69
5. Step 5: Solve for x
   x = 5,863,906.69/3,919.16
6. Step 6: Final answer
   x = 1,496.22