Finding the Fourth Proportional to 42,771, 64,183.24 and 20,586.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,771 : 64,183.24 = 20,586.72 : x
2. Step 2: Convert to fraction form
   42,771/64,183.24 = 20,586.72/x
3. Step 3: Cross multiply
   42,771x = 64,183.24 × 20,586.72
4. Step 4: Simplify right side
   42,771x = 1,321,322,390.57
5. Step 5: Solve for x
   x = 1,321,322,390.57/42,771
6. Step 6: Final answer
   x = 30,892.95