Finding the Fourth Proportional to 139,404.84, 192,336.30 and 78,965.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139,404.84 : 192,336.30 = 78,965.88 : x
2. Step 2: Convert to fraction form
   139,404.84/192,336.30 = 78,965.88/x
3. Step 3: Cross multiply
   139,404.84x = 192,336.30 × 78,965.88
4. Step 4: Simplify right side
   139,404.84x = 15,188,005,185.44
5. Step 5: Solve for x
   x = 15,188,005,185.44/139,404.84
6. Step 6: Final answer
   x = 108,948.91