Finding the Fourth Proportional to 139,423.91, 192,389.37 and 78,981.62

Step by Step Solution

1. Step 1: Write the proportion equation
   139,423.91 : 192,389.37 = 78,981.62 : x
2. Step 2: Convert to fraction form
   139,423.91/192,389.37 = 78,981.62/x
3. Step 3: Cross multiply
   139,423.91x = 192,389.37 × 78,981.62
4. Step 4: Simplify right side
   139,423.91x = 15,195,223,151.43
5. Step 5: Solve for x
   x = 15,195,223,151.43/139,423.91
6. Step 6: Final answer
   x = 108,985.78