Finding the Fourth Proportional to 20,145.88, 30,216.42 and 5,355.88

Step by Step Solution

1. Step 1: Write the proportion equation
   20,145.88 : 30,216.42 = 5,355.88 : x
2. Step 2: Convert to fraction form
   20,145.88/30,216.42 = 5,355.88/x
3. Step 3: Cross multiply
   20,145.88x = 30,216.42 × 5,355.88
4. Step 4: Simplify right side
   20,145.88x = 161,835,519.55
5. Step 5: Solve for x
   x = 161,835,519.55/20,145.88
6. Step 6: Final answer
   x = 8,033.18