Finding the Fourth Proportional to 139,406.88, 192,375.21 and 78,976.29

Step by Step Solution

1. Step 1: Write the proportion equation
   139,406.88 : 192,375.21 = 78,976.29 : x
2. Step 2: Convert to fraction form
   139,406.88/192,375.21 = 78,976.29/x
3. Step 3: Cross multiply
   139,406.88x = 192,375.21 × 78,976.29
4. Step 4: Simplify right side
   139,406.88x = 15,193,080,373.77
5. Step 5: Solve for x
   x = 15,193,080,373.77/139,406.88
6. Step 6: Final answer
   x = 108,983.72