Finding the Fourth Proportional to 42,822.54, 64,215.18 and 20,339.73

Step by Step Solution

1. Step 1: Write the proportion equation
   42,822.54 : 64,215.18 = 20,339.73 : x
2. Step 2: Convert to fraction form
   42,822.54/64,215.18 = 20,339.73/x
3. Step 3: Cross multiply
   42,822.54x = 64,215.18 × 20,339.73
4. Step 4: Simplify right side
   42,822.54x = 1,306,119,423.10
5. Step 5: Solve for x
   x = 1,306,119,423.10/42,822.54
6. Step 6: Final answer
   x = 30,500.75