Finding the Fourth Proportional to 139,360.29, 192,312.79 and 78,936.51

Step by Step Solution

1. Step 1: Write the proportion equation
   139,360.29 : 192,312.79 = 78,936.51 : x
2. Step 2: Convert to fraction form
   139,360.29/192,312.79 = 78,936.51/x
3. Step 3: Cross multiply
   139,360.29x = 192,312.79 × 78,936.51
4. Step 4: Simplify right side
   139,360.29x = 15,180,500,470.96
5. Step 5: Solve for x
   x = 15,180,500,470.96/139,360.29
6. Step 6: Final answer
   x = 108,929.89