Finding the Fourth Proportional to 419,693.20, 629,354.61 and 120,105.59

Step by Step Solution

1. Step 1: Write the proportion equation
   419,693.20 : 629,354.61 = 120,105.59 : x
2. Step 2: Convert to fraction form
   419,693.20/629,354.61 = 120,105.59/x
3. Step 3: Cross multiply
   419,693.20x = 629,354.61 × 120,105.59
4. Step 4: Simplify right side
   419,693.20x = 75,589,003,606.50
5. Step 5: Solve for x
   x = 75,589,003,606.50/419,693.20
6. Step 6: Final answer
   x = 180,105.38