Finding the Fourth Proportional to 139,225.94, 192,125.98 and 78,799.89

Step by Step Solution

1. Step 1: Write the proportion equation
   139,225.94 : 192,125.98 = 78,799.89 : x
2. Step 2: Convert to fraction form
   139,225.94/192,125.98 = 78,799.89/x
3. Step 3: Cross multiply
   139,225.94x = 192,125.98 × 78,799.89
4. Step 4: Simplify right side
   139,225.94x = 15,139,505,385.16
5. Step 5: Solve for x
   x = 15,139,505,385.16/139,225.94
6. Step 6: Final answer
   x = 108,740.55