Finding the Fourth Proportional to 139,839.21, 192,971.46 and 79,401.96

Step by Step Solution

1. Step 1: Write the proportion equation
   139,839.21 : 192,971.46 = 79,401.96 : x
2. Step 2: Convert to fraction form
   139,839.21/192,971.46 = 79,401.96/x
3. Step 3: Cross multiply
   139,839.21x = 192,971.46 × 79,401.96
4. Step 4: Simplify right side
   139,839.21x = 15,322,312,148.06
5. Step 5: Solve for x
   x = 15,322,312,148.06/139,839.21
6. Step 6: Final answer
   x = 109,570.93