Finding the Fourth Proportional to 139,792.61, 192,901.57 and 79,365.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,792.61 : 192,901.57 = 79,365.80 : x
2. Step 2: Convert to fraction form
   139,792.61/192,901.57 = 79,365.80/x
3. Step 3: Cross multiply
   139,792.61x = 192,901.57 × 79,365.80
4. Step 4: Simplify right side
   139,792.61x = 15,309,786,261.38
5. Step 5: Solve for x
   x = 15,309,786,261.38/139,792.61
6. Step 6: Final answer
   x = 109,517.86