Finding the Fourth Proportional to 139,048.92, 208,505.34 and 50,289.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,048.92 : 208,505.34 = 50,289.12 : x
2. Step 2: Convert to fraction form
   139,048.92/208,505.34 = 50,289.12/x
3. Step 3: Cross multiply
   139,048.92x = 208,505.34 × 50,289.12
4. Step 4: Simplify right side
   139,048.92x = 10,485,550,063.90
5. Step 5: Solve for x
   x = 10,485,550,063.90/139,048.92
6. Step 6: Final answer
   x = 75,409.07