Finding the Fourth Proportional to 139,262.78, 192,226.38 and 88,961.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,262.78 : 192,226.38 = 88,961.78 : x
2. Step 2: Convert to fraction form
   139,262.78/192,226.38 = 88,961.78/x
3. Step 3: Cross multiply
   139,262.78x = 192,226.38 × 88,961.78
4. Step 4: Simplify right side
   139,262.78x = 17,100,800,927.76
5. Step 5: Solve for x
   x = 17,100,800,927.76/139,262.78
6. Step 6: Final answer
   x = 122,795.20