Finding the Fourth Proportional to 120,309.94, 180,345.87 and 57,018.82

Step by Step Solution

1. Step 1: Write the proportion equation
   120,309.94 : 180,345.87 = 57,018.82 : x
2. Step 2: Convert to fraction form
   120,309.94/180,345.87 = 57,018.82/x
3. Step 3: Cross multiply
   120,309.94x = 180,345.87 × 57,018.82
4. Step 4: Simplify right side
   120,309.94x = 10,283,108,699.27
5. Step 5: Solve for x
   x = 10,283,108,699.27/120,309.94
6. Step 6: Final answer
   x = 85,471.81