Finding the Fourth Proportional to 12,185.16, 16,816.50 and 9,687.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,185.16 : 16,816.50 = 9,687.88 : x
2. Step 2: Convert to fraction form
   12,185.16/16,816.50 = 9,687.88/x
3. Step 3: Cross multiply
   12,185.16x = 16,816.50 × 9,687.88
4. Step 4: Simplify right side
   12,185.16x = 162,916,234.02
5. Step 5: Solve for x
   x = 162,916,234.02/12,185.16
6. Step 6: Final answer
   x = 13,370.05