Finding the Fourth Proportional to 139,379.25, 192,343.05 and 78,949.74

Step by Step Solution

1. Step 1: Write the proportion equation
   139,379.25 : 192,343.05 = 78,949.74 : x
2. Step 2: Convert to fraction form
   139,379.25/192,343.05 = 78,949.74/x
3. Step 3: Cross multiply
   139,379.25x = 192,343.05 × 78,949.74
4. Step 4: Simplify right side
   139,379.25x = 15,185,433,788.31
5. Step 5: Solve for x
   x = 15,185,433,788.31/139,379.25
6. Step 6: Final answer
   x = 108,950.46