Finding the Fourth Proportional to 21,458.22, 32,152.25 and 20,638.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,458.22 : 32,152.25 = 20,638.10 : x
2. Step 2: Convert to fraction form
   21,458.22/32,152.25 = 20,638.10/x
3. Step 3: Cross multiply
   21,458.22x = 32,152.25 × 20,638.10
4. Step 4: Simplify right side
   21,458.22x = 663,561,086.77
5. Step 5: Solve for x
   x = 663,561,086.77/21,458.22
6. Step 6: Final answer
   x = 30,923.40