Finding the Fourth Proportional to 16,389.72, 24,587.34 and 5,145.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,389.72 : 24,587.34 = 5,145.78 : x
2. Step 2: Convert to fraction form
   16,389.72/24,587.34 = 5,145.78/x
3. Step 3: Cross multiply
   16,389.72x = 24,587.34 × 5,145.78
4. Step 4: Simplify right side
   16,389.72x = 126,521,042.43
5. Step 5: Solve for x
   x = 126,521,042.43/16,389.72
6. Step 6: Final answer
   x = 7,719.54