Finding the Fourth Proportional to 57,945.82, 86,957.69 and 20,505.75

Step by Step Solution

1. Step 1: Write the proportion equation
   57,945.82 : 86,957.69 = 20,505.75 : x
2. Step 2: Convert to fraction form
   57,945.82/86,957.69 = 20,505.75/x
3. Step 3: Cross multiply
   57,945.82x = 86,957.69 × 20,505.75
4. Step 4: Simplify right side
   57,945.82x = 1,783,132,651.72
5. Step 5: Solve for x
   x = 1,783,132,651.72/57,945.82
6. Step 6: Final answer
   x = 30,772.41