Finding the Fourth Proportional to 22,499.28, 30,823.86 and 21,658.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,499.28 : 30,823.86 = 21,658.20 : x
2. Step 2: Convert to fraction form
   22,499.28/30,823.86 = 21,658.20/x
3. Step 3: Cross multiply
   22,499.28x = 30,823.86 × 21,658.20
4. Step 4: Simplify right side
   22,499.28x = 667,589,324.65
5. Step 5: Solve for x
   x = 667,589,324.65/22,499.28
6. Step 6: Final answer
   x = 29,671.59