Finding the Fourth Proportional to 120,481.78, 180,477.24 and 57,109.82

Step by Step Solution

1. Step 1: Write the proportion equation
   120,481.78 : 180,477.24 = 57,109.82 : x
2. Step 2: Convert to fraction form
   120,481.78/180,477.24 = 57,109.82/x
3. Step 3: Cross multiply
   120,481.78x = 180,477.24 × 57,109.82
4. Step 4: Simplify right side
   120,481.78x = 10,307,022,690.50
5. Step 5: Solve for x
   x = 10,307,022,690.50/120,481.78
6. Step 6: Final answer
   x = 85,548.39