Finding the Fourth Proportional to 22,160.88, 30,581.82 and 12,729.60

Step by Step Solution

1. Step 1: Write the proportion equation
   22,160.88 : 30,581.82 = 12,729.60 : x
2. Step 2: Convert to fraction form
   22,160.88/30,581.82 = 12,729.60/x
3. Step 3: Cross multiply
   22,160.88x = 30,581.82 × 12,729.60
4. Step 4: Simplify right side
   22,160.88x = 389,294,335.87
5. Step 5: Solve for x
   x = 389,294,335.87/22,160.88
6. Step 6: Final answer
   x = 17,566.74