Finding the Fourth Proportional to 139,149.24, 192,026.01 and 78,718.61

Step by Step Solution

1. Step 1: Write the proportion equation
   139,149.24 : 192,026.01 = 78,718.61 : x
2. Step 2: Convert to fraction form
   139,149.24/192,026.01 = 78,718.61/x
3. Step 3: Cross multiply
   139,149.24x = 192,026.01 × 78,718.61
4. Step 4: Simplify right side
   139,149.24x = 15,116,019,630.92
5. Step 5: Solve for x
   x = 15,116,019,630.92/139,149.24
6. Step 6: Final answer
   x = 108,631.71