Finding the Fourth Proportional to 139,179.37, 192,067.56 and 78,748.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,179.37 : 192,067.56 = 78,748.72 : x
2. Step 2: Convert to fraction form
   139,179.37/192,067.56 = 78,748.72/x
3. Step 3: Cross multiply
   139,179.37x = 192,067.56 × 78,748.72
4. Step 4: Simplify right side
   139,179.37x = 15,125,074,503.52
5. Step 5: Solve for x
   x = 15,125,074,503.52/139,179.37
6. Step 6: Final answer
   x = 108,673.25