Finding the Fourth Proportional to 139,164.36, 192,046.88 and 78,733.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,164.36 : 192,046.88 = 78,733.78 : x
2. Step 2: Convert to fraction form
   139,164.36/192,046.88 = 78,733.78/x
3. Step 3: Cross multiply
   139,164.36x = 192,046.88 × 78,733.78
4. Step 4: Simplify right side
   139,164.36x = 15,120,576,799.61
5. Step 5: Solve for x
   x = 15,120,576,799.61/139,164.36
6. Step 6: Final answer
   x = 108,652.65