Finding the Fourth Proportional to 139,423.69, 192,389.08 and 78,981.39

Step by Step Solution

1. Step 1: Write the proportion equation
   139,423.69 : 192,389.08 = 78,981.39 : x
2. Step 2: Convert to fraction form
   139,423.69/192,389.08 = 78,981.39/x
3. Step 3: Cross multiply
   139,423.69x = 192,389.08 × 78,981.39
4. Step 4: Simplify right side
   139,423.69x = 15,195,156,959.22
5. Step 5: Solve for x
   x = 15,195,156,959.22/139,423.69
6. Step 6: Final answer
   x = 108,985.47