Finding the Fourth Proportional to 419,728.72, 629,503.33 and 120,128.86

Step by Step Solution

1. Step 1: Write the proportion equation
   419,728.72 : 629,503.33 = 120,128.86 : x
2. Step 2: Convert to fraction form
   419,728.72/629,503.33 = 120,128.86/x
3. Step 3: Cross multiply
   419,728.72x = 629,503.33 × 120,128.86
4. Step 4: Simplify right side
   419,728.72x = 75,621,517,399.10
5. Step 5: Solve for x
   x = 75,621,517,399.10/419,728.72
6. Step 6: Final answer
   x = 180,167.60