Finding the Fourth Proportional to 139,818.10, 192,958.06 and 83,221.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,818.10 : 192,958.06 = 83,221.78 : x
2. Step 2: Convert to fraction form
   139,818.10/192,958.06 = 83,221.78/x
3. Step 3: Cross multiply
   139,818.10x = 192,958.06 × 83,221.78
4. Step 4: Simplify right side
   139,818.10x = 16,058,313,218.55
5. Step 5: Solve for x
   x = 16,058,313,218.55/139,818.10
6. Step 6: Final answer
   x = 114,851.46