Finding the Fourth Proportional to 21,315.72, 29,404.87 and 16,271.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,315.72 : 29,404.87 = 16,271.18 : x
2. Step 2: Convert to fraction form
   21,315.72/29,404.87 = 16,271.18/x
3. Step 3: Cross multiply
   21,315.72x = 29,404.87 × 16,271.18
4. Step 4: Simplify right side
   21,315.72x = 478,451,744.94
5. Step 5: Solve for x
   x = 478,451,744.94/21,315.72
6. Step 6: Final answer
   x = 22,445.96