Finding the Fourth Proportional to 139,208.88, 192,096.72 and 78,776.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,208.88 : 192,096.72 = 78,776.40 : x
2. Step 2: Convert to fraction form
   139,208.88/192,096.72 = 78,776.40/x
3. Step 3: Cross multiply
   139,208.88x = 192,096.72 × 78,776.40
4. Step 4: Simplify right side
   139,208.88x = 15,132,688,053.41
5. Step 5: Solve for x
   x = 15,132,688,053.41/139,208.88
6. Step 6: Final answer
   x = 108,704.90