Finding the Fourth Proportional to 139,367.98, 192,333.09 and 78,115.29

Step by Step Solution

1. Step 1: Write the proportion equation
   139,367.98 : 192,333.09 = 78,115.29 : x
2. Step 2: Convert to fraction form
   139,367.98/192,333.09 = 78,115.29/x
3. Step 3: Cross multiply
   139,367.98x = 192,333.09 × 78,115.29
4. Step 4: Simplify right side
   139,367.98x = 15,024,154,711.37
5. Step 5: Solve for x
   x = 15,024,154,711.37/139,367.98
6. Step 6: Final answer
   x = 107,802.06