Finding the Fourth Proportional to 3,945.73, 5,909.37 and 3,118.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945.73 : 5,909.37 = 3,118.45 : x
2. Step 2: Convert to fraction form
   3,945.73/5,909.37 = 3,118.45/x
3. Step 3: Cross multiply
   3,945.73x = 5,909.37 × 3,118.45
4. Step 4: Simplify right side
   3,945.73x = 18,428,074.88
5. Step 5: Solve for x
   x = 18,428,074.88/3,945.73
6. Step 6: Final answer
   x = 4,670.38