Finding the Fourth Proportional to 139,671.38, 209,548.38 and 80,549.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,671.38 : 209,548.38 = 80,549.48 : x
2. Step 2: Convert to fraction form
   139,671.38/209,548.38 = 80,549.48/x
3. Step 3: Cross multiply
   139,671.38x = 209,548.38 × 80,549.48
4. Step 4: Simplify right side
   139,671.38x = 16,879,011,996.10
5. Step 5: Solve for x
   x = 16,879,011,996.10/139,671.38
6. Step 6: Final answer
   x = 120,848.04