Finding the Fourth Proportional to 22,957.76, 31,680 and 12,884.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,957.76 : 31,680 = 12,884.72 : x
2. Step 2: Convert to fraction form
   22,957.76/31,680 = 12,884.72/x
3. Step 3: Cross multiply
   22,957.76x = 31,680 × 12,884.72
4. Step 4: Simplify right side
   22,957.76x = 408,187,929.60
5. Step 5: Solve for x
   x = 408,187,929.60/22,957.76
6. Step 6: Final answer
   x = 17,779.95