Finding the Fourth Proportional to 139,422.11, 192,401.85 and 78,992.61

Step by Step Solution

1. Step 1: Write the proportion equation
   139,422.11 : 192,401.85 = 78,992.61 : x
2. Step 2: Convert to fraction form
   139,422.11/192,401.85 = 78,992.61/x
3. Step 3: Cross multiply
   139,422.11x = 192,401.85 × 78,992.61
4. Step 4: Simplify right side
   139,422.11x = 15,198,324,300.33
5. Step 5: Solve for x
   x = 15,198,324,300.33/139,422.11
6. Step 6: Final answer
   x = 109,009.43