Finding the Fourth Proportional to 16,390.72, 24,588.84 and 5,146.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,390.72 : 24,588.84 = 5,146.78 : x
2. Step 2: Convert to fraction form
   16,390.72/24,588.84 = 5,146.78/x
3. Step 3: Cross multiply
   16,390.72x = 24,588.84 × 5,146.78
4. Step 4: Simplify right side
   16,390.72x = 126,553,349.94
5. Step 5: Solve for x
   x = 126,553,349.94/16,390.72
6. Step 6: Final answer
   x = 7,721.04