Finding the Fourth Proportional to 12,582.72, 18,865.98 and 3,815.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,582.72 : 18,865.98 = 3,815.28 : x
2. Step 2: Convert to fraction form
   12,582.72/18,865.98 = 3,815.28/x
3. Step 3: Cross multiply
   12,582.72x = 18,865.98 × 3,815.28
4. Step 4: Simplify right side
   12,582.72x = 71,978,996.17
5. Step 5: Solve for x
   x = 71,978,996.17/12,582.72
6. Step 6: Final answer
   x = 5,720.46