Finding the Fourth Proportional to 21,929.76, 30,256.56 and 12,497.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,929.76 : 30,256.56 = 12,497.76 : x
2. Step 2: Convert to fraction form
   21,929.76/30,256.56 = 12,497.76/x
3. Step 3: Cross multiply
   21,929.76x = 30,256.56 × 12,497.76
4. Step 4: Simplify right side
   21,929.76x = 378,139,225.31
5. Step 5: Solve for x
   x = 378,139,225.31/21,929.76
6. Step 6: Final answer
   x = 17,243.20