Finding the Fourth Proportional to 72,728.58, 109,073.43 and 20,140.95

Step by Step Solution

1. Step 1: Write the proportion equation
   72,728.58 : 109,073.43 = 20,140.95 : x
2. Step 2: Convert to fraction form
   72,728.58/109,073.43 = 20,140.95/x
3. Step 3: Cross multiply
   72,728.58x = 109,073.43 × 20,140.95
4. Step 4: Simplify right side
   72,728.58x = 2,196,842,499.96
5. Step 5: Solve for x
   x = 2,196,842,499.96/72,728.58
6. Step 6: Final answer
   x = 30,206.04