Finding the Fourth Proportional to 139,424.10, 192,404.60 and 78,994.62

Step by Step Solution

1. Step 1: Write the proportion equation
   139,424.10 : 192,404.60 = 78,994.62 : x
2. Step 2: Convert to fraction form
   139,424.10/192,404.60 = 78,994.62/x
3. Step 3: Cross multiply
   139,424.10x = 192,404.60 × 78,994.62
4. Step 4: Simplify right side
   139,424.10x = 15,198,928,263.25
5. Step 5: Solve for x
   x = 15,198,928,263.25/139,424.10
6. Step 6: Final answer
   x = 109,012.20