Finding the Fourth Proportional to 21,851.38, 30,269.10 and 21,408.51

Step by Step Solution

1. Step 1: Write the proportion equation
   21,851.38 : 30,269.10 = 21,408.51 : x
2. Step 2: Convert to fraction form
   21,851.38/30,269.10 = 21,408.51/x
3. Step 3: Cross multiply
   21,851.38x = 30,269.10 × 21,408.51
4. Step 4: Simplify right side
   21,851.38x = 648,016,330.04
5. Step 5: Solve for x
   x = 648,016,330.04/21,851.38
6. Step 6: Final answer
   x = 29,655.63