Finding the Fourth Proportional to 21,822.58, 30,118.67 and 20,397.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,822.58 : 30,118.67 = 20,397.96 : x
2. Step 2: Convert to fraction form
   21,822.58/30,118.67 = 20,397.96/x
3. Step 3: Cross multiply
   21,822.58x = 30,118.67 × 20,397.96
4. Step 4: Simplify right side
   21,822.58x = 614,359,400.42
5. Step 5: Solve for x
   x = 614,359,400.42/21,822.58
6. Step 6: Final answer
   x = 28,152.46