Finding the Fourth Proportional to 105,469.48, 158,145.90 and 80,178.04

Step by Step Solution

1. Step 1: Write the proportion equation
   105,469.48 : 158,145.90 = 80,178.04 : x
2. Step 2: Convert to fraction form
   105,469.48/158,145.90 = 80,178.04/x
3. Step 3: Cross multiply
   105,469.48x = 158,145.90 × 80,178.04
4. Step 4: Simplify right side
   105,469.48x = 12,679,828,296.04
5. Step 5: Solve for x
   x = 12,679,828,296.04/105,469.48
6. Step 6: Final answer
   x = 120,222.73