Finding the Fourth Proportional to 139,423.82, 192,389.24 and 78,981.51

Step by Step Solution

1. Step 1: Write the proportion equation
   139,423.82 : 192,389.24 = 78,981.51 : x
2. Step 2: Convert to fraction form
   139,423.82/192,389.24 = 78,981.51/x
3. Step 3: Cross multiply
   139,423.82x = 192,389.24 × 78,981.51
4. Step 4: Simplify right side
   139,423.82x = 15,195,193,601.87
5. Step 5: Solve for x
   x = 15,195,193,601.87/139,423.82
6. Step 6: Final answer
   x = 108,985.64