Finding the Fourth Proportional to 20,665.29, 30,792.72 and 19,661.16

Step by Step Solution

1. Step 1: Write the proportion equation
   20,665.29 : 30,792.72 = 19,661.16 : x
2. Step 2: Convert to fraction form
   20,665.29/30,792.72 = 19,661.16/x
3. Step 3: Cross multiply
   20,665.29x = 30,792.72 × 19,661.16
4. Step 4: Simplify right side
   20,665.29x = 605,420,594.76
5. Step 5: Solve for x
   x = 605,420,594.76/20,665.29
6. Step 6: Final answer
   x = 29,296.50