Finding the Fourth Proportional to 139,391.28, 209,100.60 and 80,112.24

Step by Step Solution

1. Step 1: Write the proportion equation
   139,391.28 : 209,100.60 = 80,112.24 : x
2. Step 2: Convert to fraction form
   139,391.28/209,100.60 = 80,112.24/x
3. Step 3: Cross multiply
   139,391.28x = 209,100.60 × 80,112.24
4. Step 4: Simplify right side
   139,391.28x = 16,751,517,451.34
5. Step 5: Solve for x
   x = 16,751,517,451.34/139,391.28
6. Step 6: Final answer
   x = 120,176.22