Finding the Fourth Proportional to 139,520.30, 209,153.88 and 50,711.09

Step by Step Solution

1. Step 1: Write the proportion equation
   139,520.30 : 209,153.88 = 50,711.09 : x
2. Step 2: Convert to fraction form
   139,520.30/209,153.88 = 50,711.09/x
3. Step 3: Cross multiply
   139,520.30x = 209,153.88 × 50,711.09
4. Step 4: Simplify right side
   139,520.30x = 10,606,420,186.76
5. Step 5: Solve for x
   x = 10,606,420,186.76/139,520.30
6. Step 6: Final answer
   x = 76,020.63