Finding the Fourth Proportional to 72,644.72, 108,958.88 and 20,061.68

Step by Step Solution

1. Step 1: Write the proportion equation
   72,644.72 : 108,958.88 = 20,061.68 : x
2. Step 2: Convert to fraction form
   72,644.72/108,958.88 = 20,061.68/x
3. Step 3: Cross multiply
   72,644.72x = 108,958.88 × 20,061.68
4. Step 4: Simplify right side
   72,644.72x = 2,185,898,183.72
5. Step 5: Solve for x
   x = 2,185,898,183.72/72,644.72
6. Step 6: Final answer
   x = 30,090.26