Finding the Fourth Proportional to 72,639.27, 108,965.99 and 28,269.63

Step by Step Solution

1. Step 1: Write the proportion equation
   72,639.27 : 108,965.99 = 28,269.63 : x
2. Step 2: Convert to fraction form
   72,639.27/108,965.99 = 28,269.63/x
3. Step 3: Cross multiply
   72,639.27x = 108,965.99 × 28,269.63
4. Step 4: Simplify right side
   72,639.27x = 3,080,428,078.54
5. Step 5: Solve for x
   x = 3,080,428,078.54/72,639.27
6. Step 6: Final answer
   x = 42,407.20