Finding the Fourth Proportional to 139,336.76, 192,278.50 and 78,906.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,336.76 : 192,278.50 = 78,906.12 : x
2. Step 2: Convert to fraction form
   139,336.76/192,278.50 = 78,906.12/x
3. Step 3: Cross multiply
   139,336.76x = 192,278.50 × 78,906.12
4. Step 4: Simplify right side
   139,336.76x = 15,171,950,197.15
5. Step 5: Solve for x
   x = 15,171,950,197.15/139,336.76
6. Step 6: Final answer
   x = 108,886.92