Finding the Fourth Proportional to 72,871.98, 109,304.46 and 20,280.30

Step by Step Solution

1. Step 1: Write the proportion equation
   72,871.98 : 109,304.46 = 20,280.30 : x
2. Step 2: Convert to fraction form
   72,871.98/109,304.46 = 20,280.30/x
3. Step 3: Cross multiply
   72,871.98x = 109,304.46 × 20,280.30
4. Step 4: Simplify right side
   72,871.98x = 2,216,727,240.14
5. Step 5: Solve for x
   x = 2,216,727,240.14/72,871.98
6. Step 6: Final answer
   x = 30,419.47