Finding the Fourth Proportional to 16,695.72, 23,039.64 and 9,621.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,695.72 : 23,039.64 = 9,621.72 : x
2. Step 2: Convert to fraction form
   16,695.72/23,039.64 = 9,621.72/x
3. Step 3: Cross multiply
   16,695.72x = 23,039.64 × 9,621.72
4. Step 4: Simplify right side
   16,695.72x = 221,680,964.98
5. Step 5: Solve for x
   x = 221,680,964.98/16,695.72
6. Step 6: Final answer
   x = 13,277.71