Finding the Fourth Proportional to 139,423.41, 192,388.69 and 78,981.11

Step by Step Solution

1. Step 1: Write the proportion equation
   139,423.41 : 192,388.69 = 78,981.11 : x
2. Step 2: Convert to fraction form
   139,423.41/192,388.69 = 78,981.11/x
3. Step 3: Cross multiply
   139,423.41x = 192,388.69 × 78,981.11
4. Step 4: Simplify right side
   139,423.41x = 15,195,071,892.74
5. Step 5: Solve for x
   x = 15,195,071,892.74/139,423.41
6. Step 6: Final answer
   x = 108,985.08