Finding the Fourth Proportional to 21,464.72, 32,162 and 20,644.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,464.72 : 32,162 = 20,644.60 : x
2. Step 2: Convert to fraction form
   21,464.72/32,162 = 20,644.60/x
3. Step 3: Cross multiply
   21,464.72x = 32,162 × 20,644.60
4. Step 4: Simplify right side
   21,464.72x = 663,971,625.20
5. Step 5: Solve for x
   x = 663,971,625.20/21,464.72
6. Step 6: Final answer
   x = 30,933.16