Finding the Fourth Proportional to 21,168.72, 29,157.96 and 14,784.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,168.72 : 29,157.96 = 14,784.08 : x
2. Step 2: Convert to fraction form
   21,168.72/29,157.96 = 14,784.08/x
3. Step 3: Cross multiply
   21,168.72x = 29,157.96 × 14,784.08
4. Step 4: Simplify right side
   21,168.72x = 431,073,613.28
5. Step 5: Solve for x
   x = 431,073,613.28/21,168.72
6. Step 6: Final answer
   x = 20,363.71