Finding the Fourth Proportional to 139,568.31, 192,560.81 and 79,134.21

Step by Step Solution

1. Step 1: Write the proportion equation
   139,568.31 : 192,560.81 = 79,134.21 : x
2. Step 2: Convert to fraction form
   139,568.31/192,560.81 = 79,134.21/x
3. Step 3: Cross multiply
   139,568.31x = 192,560.81 × 79,134.21
4. Step 4: Simplify right side
   139,568.31x = 15,238,147,576.31
5. Step 5: Solve for x
   x = 15,238,147,576.31/139,568.31
6. Step 6: Final answer
   x = 109,180.57