Finding the Fourth Proportional to 12,021.59, 18,007.90 and 9,808.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,021.59 : 18,007.90 = 9,808.31 : x
2. Step 2: Convert to fraction form
   12,021.59/18,007.90 = 9,808.31/x
3. Step 3: Cross multiply
   12,021.59x = 18,007.90 × 9,808.31
4. Step 4: Simplify right side
   12,021.59x = 176,627,086.15
5. Step 5: Solve for x
   x = 176,627,086.15/12,021.59
6. Step 6: Final answer
   x = 14,692.49