Finding the Fourth Proportional to 139,380.27, 192,338.61 and 78,949.70

Step by Step Solution

1. Step 1: Write the proportion equation
   139,380.27 : 192,338.61 = 78,949.70 : x
2. Step 2: Convert to fraction form
   139,380.27/192,338.61 = 78,949.70/x
3. Step 3: Cross multiply
   139,380.27x = 192,338.61 × 78,949.70
4. Step 4: Simplify right side
   139,380.27x = 15,185,075,557.92
5. Step 5: Solve for x
   x = 15,185,075,557.92/139,380.27
6. Step 6: Final answer
   x = 108,947.10