Finding the Fourth Proportional to 139,439.68, 209,093.92 and 50,630.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,439.68 : 209,093.92 = 50,630.40 : x
2. Step 2: Convert to fraction form
   139,439.68/209,093.92 = 50,630.40/x
3. Step 3: Cross multiply
   139,439.68x = 209,093.92 × 50,630.40
4. Step 4: Simplify right side
   139,439.68x = 10,586,508,807.17
5. Step 5: Solve for x
   x = 10,586,508,807.17/139,439.68
6. Step 6: Final answer
   x = 75,921.78