Finding the Fourth Proportional to 12,147.72, 16,771.59 and 9,914.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,147.72 : 16,771.59 = 9,914.92 : x
2. Step 2: Convert to fraction form
   12,147.72/16,771.59 = 9,914.92/x
3. Step 3: Cross multiply
   12,147.72x = 16,771.59 × 9,914.92
4. Step 4: Simplify right side
   12,147.72x = 166,288,973.12
5. Step 5: Solve for x
   x = 166,288,973.12/12,147.72
6. Step 6: Final answer
   x = 13,688.90