Finding the Fourth Proportional to 139,872, 193,025.28 and 80,256

Step by Step Solution

1. Step 1: Write the proportion equation
   139,872 : 193,025.28 = 80,256 : x
2. Step 2: Convert to fraction form
   139,872/193,025.28 = 80,256/x
3. Step 3: Cross multiply
   139,872x = 193,025.28 × 80,256
4. Step 4: Simplify right side
   139,872x = 15,491,436,871.68
5. Step 5: Solve for x
   x = 15,491,436,871.68/139,872
6. Step 6: Final answer
   x = 110,754.38