Finding the Fourth Proportional to 20,665.63, 30,981.15 and 9,580.28

Step by Step Solution

1. Step 1: Write the proportion equation
   20,665.63 : 30,981.15 = 9,580.28 : x
2. Step 2: Convert to fraction form
   20,665.63/30,981.15 = 9,580.28/x
3. Step 3: Cross multiply
   20,665.63x = 30,981.15 × 9,580.28
4. Step 4: Simplify right side
   20,665.63x = 296,808,169.17
5. Step 5: Solve for x
   x = 296,808,169.17/20,665.63
6. Step 6: Final answer
   x = 14,362.41