Finding the Fourth Proportional to 11,665.88, 16,055.26 and 10,721.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,665.88 : 16,055.26 = 10,721.72 : x
2. Step 2: Convert to fraction form
   11,665.88/16,055.26 = 10,721.72/x
3. Step 3: Cross multiply
   11,665.88x = 16,055.26 × 10,721.72
4. Step 4: Simplify right side
   11,665.88x = 172,140,002.25
5. Step 5: Solve for x
   x = 172,140,002.25/11,665.88
6. Step 6: Final answer
   x = 14,755.85