Finding the Fourth Proportional to 20,188.10, 30,287.55 and 14,356.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,188.10 : 30,287.55 = 14,356.10 : x
2. Step 2: Convert to fraction form
   20,188.10/30,287.55 = 14,356.10/x
3. Step 3: Cross multiply
   20,188.10x = 30,287.55 × 14,356.10
4. Step 4: Simplify right side
   20,188.10x = 434,811,096.56
5. Step 5: Solve for x
   x = 434,811,096.56/20,188.10
6. Step 6: Final answer
   x = 21,537.99