Finding the Fourth Proportional to 11,662.72, 17,405.93 and 10,872.64

Step by Step Solution

1. Step 1: Write the proportion equation
   11,662.72 : 17,405.93 = 10,872.64 : x
2. Step 2: Convert to fraction form
   11,662.72/17,405.93 = 10,872.64/x
3. Step 3: Cross multiply
   11,662.72x = 17,405.93 × 10,872.64
4. Step 4: Simplify right side
   11,662.72x = 189,248,410.76
5. Step 5: Solve for x
   x = 189,248,410.76/11,662.72
6. Step 6: Final answer
   x = 16,226.78