Finding the Fourth Proportional to 139,642.92, 192,699 and 78,383.34

Step by Step Solution

1. Step 1: Write the proportion equation
   139,642.92 : 192,699 = 78,383.34 : x
2. Step 2: Convert to fraction form
   139,642.92/192,699 = 78,383.34/x
3. Step 3: Cross multiply
   139,642.92x = 192,699 × 78,383.34
4. Step 4: Simplify right side
   139,642.92x = 15,104,391,234.66
5. Step 5: Solve for x
   x = 15,104,391,234.66/139,642.92
6. Step 6: Final answer
   x = 108,164.39