Finding the Fourth Proportional to 22,910.67, 31,616.49 and 12,839.55

Step by Step Solution

1. Step 1: Write the proportion equation
   22,910.67 : 31,616.49 = 12,839.55 : x
2. Step 2: Convert to fraction form
   22,910.67/31,616.49 = 12,839.55/x
3. Step 3: Cross multiply
   22,910.67x = 31,616.49 × 12,839.55
4. Step 4: Simplify right side
   22,910.67x = 405,941,504.18
5. Step 5: Solve for x
   x = 405,941,504.18/22,910.67
6. Step 6: Final answer
   x = 17,718.45