Finding the Fourth Proportional to 139,874.10, 209,648.43 and 79,944.54

Step by Step Solution

1. Step 1: Write the proportion equation
   139,874.10 : 209,648.43 = 79,944.54 : x
2. Step 2: Convert to fraction form
   139,874.10/209,648.43 = 79,944.54/x
3. Step 3: Cross multiply
   139,874.10x = 209,648.43 × 79,944.54
4. Step 4: Simplify right side
   139,874.10x = 16,760,247,298.07
5. Step 5: Solve for x
   x = 16,760,247,298.07/139,874.10
6. Step 6: Final answer
   x = 119,823.81