Finding the Fourth Proportional to 20,216.13, 30,308.00 and 13,559.55

Step by Step Solution

1. Step 1: Write the proportion equation
   20,216.13 : 30,308.00 = 13,559.55 : x
2. Step 2: Convert to fraction form
   20,216.13/30,308.00 = 13,559.55/x
3. Step 3: Cross multiply
   20,216.13x = 30,308.00 × 13,559.55
4. Step 4: Simplify right side
   20,216.13x = 410,962,773.60
5. Step 5: Solve for x
   x = 410,962,773.60/20,216.13
6. Step 6: Final answer
   x = 20,328.46