Finding the Fourth Proportional to 139,178.37, 192,066.18 and 78,747.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,178.37 : 192,066.18 = 78,747.72 : x
2. Step 2: Convert to fraction form
   139,178.37/192,066.18 = 78,747.72/x
3. Step 3: Cross multiply
   139,178.37x = 192,066.18 × 78,747.72
4. Step 4: Simplify right side
   139,178.37x = 15,124,773,764.11
5. Step 5: Solve for x
   x = 15,124,773,764.11/139,178.37
6. Step 6: Final answer
   x = 108,671.87