Finding the Fourth Proportional to 20,156.50, 30,086.81 and 18,672.09

Step by Step Solution

1. Step 1: Write the proportion equation
   20,156.50 : 30,086.81 = 18,672.09 : x
2. Step 2: Convert to fraction form
   20,156.50/30,086.81 = 18,672.09/x
3. Step 3: Cross multiply
   20,156.50x = 30,086.81 × 18,672.09
4. Step 4: Simplify right side
   20,156.50x = 561,783,624.13
5. Step 5: Solve for x
   x = 561,783,624.13/20,156.50
6. Step 6: Final answer
   x = 27,871.09