Finding the Fourth Proportional to 139,401.07, 192,367.20 and 78,970.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,401.07 : 192,367.20 = 78,970.48 : x
2. Step 2: Convert to fraction form
   139,401.07/192,367.20 = 78,970.48/x
3. Step 3: Cross multiply
   139,401.07x = 192,367.20 × 78,970.48
4. Step 4: Simplify right side
   139,401.07x = 15,191,329,935.48
5. Step 5: Solve for x
   x = 15,191,329,935.48/139,401.07
6. Step 6: Final answer
   x = 108,975.71