Finding the Fourth Proportional to 21,514.72, 29,616.60 and 18,665.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,514.72 : 29,616.60 = 18,665.32 : x
2. Step 2: Convert to fraction form
   21,514.72/29,616.60 = 18,665.32/x
3. Step 3: Cross multiply
   21,514.72x = 29,616.60 × 18,665.32
4. Step 4: Simplify right side
   21,514.72x = 552,803,168.23
5. Step 5: Solve for x
   x = 552,803,168.23/21,514.72
6. Step 6: Final answer
   x = 25,694.19