Finding the Fourth Proportional to 21,711.16, 29,974.84 and 16,665.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,711.16 : 29,974.84 = 16,665.72 : x
2. Step 2: Convert to fraction form
   21,711.16/29,974.84 = 16,665.72/x
3. Step 3: Cross multiply
   21,711.16x = 29,974.84 × 16,665.72
4. Step 4: Simplify right side
   21,711.16x = 499,552,290.48
5. Step 5: Solve for x
   x = 499,552,290.48/21,711.16
6. Step 6: Final answer
   x = 23,009.01