Finding the Fourth Proportional to 139,448.30, 192,431.28 and 79,019.67

Step by Step Solution

1. Step 1: Write the proportion equation
   139,448.30 : 192,431.28 = 79,019.67 : x
2. Step 2: Convert to fraction form
   139,448.30/192,431.28 = 79,019.67/x
3. Step 3: Cross multiply
   139,448.30x = 192,431.28 × 79,019.67
4. Step 4: Simplify right side
   139,448.30x = 15,205,856,243.28
5. Step 5: Solve for x
   x = 15,205,856,243.28/139,448.30
6. Step 6: Final answer
   x = 109,042.97