Finding the Fourth Proportional to 16,387.56, 22,616.78 and 9,315.05

Step by Step Solution

1. Step 1: Write the proportion equation
   16,387.56 : 22,616.78 = 9,315.05 : x
2. Step 2: Convert to fraction form
   16,387.56/22,616.78 = 9,315.05/x
3. Step 3: Cross multiply
   16,387.56x = 22,616.78 × 9,315.05
4. Step 4: Simplify right side
   16,387.56x = 210,676,276.88
5. Step 5: Solve for x
   x = 210,676,276.88/16,387.56
6. Step 6: Final answer
   x = 12,855.87