Finding the Fourth Proportional to 139,255.16, 192,118.31 and 78,811.95

Step by Step Solution

1. Step 1: Write the proportion equation
   139,255.16 : 192,118.31 = 78,811.95 : x
2. Step 2: Convert to fraction form
   139,255.16/192,118.31 = 78,811.95/x
3. Step 3: Cross multiply
   139,255.16x = 192,118.31 × 78,811.95
4. Step 4: Simplify right side
   139,255.16x = 15,141,217,287.15
5. Step 5: Solve for x
   x = 15,141,217,287.15/139,255.16
6. Step 6: Final answer
   x = 108,730.03