Finding the Fourth Proportional to 139,245.12, 192,149.55 and 78,828.03

Step by Step Solution

1. Step 1: Write the proportion equation
   139,245.12 : 192,149.55 = 78,828.03 : x
2. Step 2: Convert to fraction form
   139,245.12/192,149.55 = 78,828.03/x
3. Step 3: Cross multiply
   139,245.12x = 192,149.55 × 78,828.03
4. Step 4: Simplify right side
   139,245.12x = 15,146,770,491.89
5. Step 5: Solve for x
   x = 15,146,770,491.89/139,245.12
6. Step 6: Final answer
   x = 108,777.75