Finding the Fourth Proportional to 22,429.98, 30,729.22 and 21,589.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,429.98 : 30,729.22 = 21,589.20 : x
2. Step 2: Convert to fraction form
   22,429.98/30,729.22 = 21,589.20/x
3. Step 3: Cross multiply
   22,429.98x = 30,729.22 × 21,589.20
4. Step 4: Simplify right side
   22,429.98x = 663,419,222.45
5. Step 5: Solve for x
   x = 663,419,222.45/22,429.98
6. Step 6: Final answer
   x = 29,577.34