Finding the Fourth Proportional to 16,383.72, 24,578.31 and 5,139.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,383.72 : 24,578.31 = 5,139.78 : x
2. Step 2: Convert to fraction form
   16,383.72/24,578.31 = 5,139.78/x
3. Step 3: Cross multiply
   16,383.72x = 24,578.31 × 5,139.78
4. Step 4: Simplify right side
   16,383.72x = 126,327,106.17
5. Step 5: Solve for x
   x = 126,327,106.17/16,383.72
6. Step 6: Final answer
   x = 7,710.53