Finding the Fourth Proportional to 22,340.33, 30,830.37 and 12,908.89

Step by Step Solution

1. Step 1: Write the proportion equation
   22,340.33 : 30,830.37 = 12,908.89 : x
2. Step 2: Convert to fraction form
   22,340.33/30,830.37 = 12,908.89/x
3. Step 3: Cross multiply
   22,340.33x = 30,830.37 × 12,908.89
4. Step 4: Simplify right side
   22,340.33x = 397,985,777.91
5. Step 5: Solve for x
   x = 397,985,777.91/22,340.33
6. Step 6: Final answer
   x = 17,814.68