Finding the Fourth Proportional to 72,986.27, 109,540.91 and 28,644.16

Step by Step Solution

1. Step 1: Write the proportion equation
   72,986.27 : 109,540.91 = 28,644.16 : x
2. Step 2: Convert to fraction form
   72,986.27/109,540.91 = 28,644.16/x
3. Step 3: Cross multiply
   72,986.27x = 109,540.91 × 28,644.16
4. Step 4: Simplify right side
   72,986.27x = 3,137,707,352.59
5. Step 5: Solve for x
   x = 3,137,707,352.59/72,986.27
6. Step 6: Final answer
   x = 42,990.38