Finding the Fourth Proportional to 67,200.27, 100,815.44 and 20,456.79

Step by Step Solution

1. Step 1: Write the proportion equation
   67,200.27 : 100,815.44 = 20,456.79 : x
2. Step 2: Convert to fraction form
   67,200.27/100,815.44 = 20,456.79/x
3. Step 3: Cross multiply
   67,200.27x = 100,815.44 × 20,456.79
4. Step 4: Simplify right side
   67,200.27x = 2,062,360,182.55
5. Step 5: Solve for x
   x = 2,062,360,182.55/67,200.27
6. Step 6: Final answer
   x = 30,689.76