Finding the Fourth Proportional to 21,709.36, 29,975.91 and 16,665.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,709.36 : 29,975.91 = 16,665.59 : x
2. Step 2: Convert to fraction form
   21,709.36/29,975.91 = 16,665.59/x
3. Step 3: Cross multiply
   21,709.36x = 29,975.91 × 16,665.59
4. Step 4: Simplify right side
   21,709.36x = 499,566,142.61
5. Step 5: Solve for x
   x = 499,566,142.61/21,709.36
6. Step 6: Final answer
   x = 23,011.56