Finding the Fourth Proportional to 20,510.16, 28,304.15 and 12,017.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,510.16 : 28,304.15 = 12,017.31 : x
2. Step 2: Convert to fraction form
   20,510.16/28,304.15 = 12,017.31/x
3. Step 3: Cross multiply
   20,510.16x = 28,304.15 × 12,017.31
4. Step 4: Simplify right side
   20,510.16x = 340,139,744.84
5. Step 5: Solve for x
   x = 340,139,744.84/20,510.16
6. Step 6: Final answer
   x = 16,583.96