Finding the Fourth Proportional to 139,162.37, 192,044.12 and 78,731.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,162.37 : 192,044.12 = 78,731.78 : x
2. Step 2: Convert to fraction form
   139,162.37/192,044.12 = 78,731.78/x
3. Step 3: Cross multiply
   139,162.37x = 192,044.12 × 78,731.78
4. Step 4: Simplify right side
   139,162.37x = 15,119,974,052.25
5. Step 5: Solve for x
   x = 15,119,974,052.25/139,162.37
6. Step 6: Final answer
   x = 108,649.88