Finding the Fourth Proportional to 21,429.27, 32,144.18 and 6,638.13

Step by Step Solution

1. Step 1: Write the proportion equation
   21,429.27 : 32,144.18 = 6,638.13 : x
2. Step 2: Convert to fraction form
   21,429.27/32,144.18 = 6,638.13/x
3. Step 3: Cross multiply
   21,429.27x = 32,144.18 × 6,638.13
4. Step 4: Simplify right side
   21,429.27x = 213,377,212.39
5. Step 5: Solve for x
   x = 213,377,212.39/21,429.27
6. Step 6: Final answer
   x = 9,957.28