Finding the Fourth Proportional to 14,839.20, 20,474.64 and 9,810.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,839.20 : 20,474.64 = 9,810.72 : x
2. Step 2: Convert to fraction form
   14,839.20/20,474.64 = 9,810.72/x
3. Step 3: Cross multiply
   14,839.20x = 20,474.64 × 9,810.72
4. Step 4: Simplify right side
   14,839.20x = 200,870,960.14
5. Step 5: Solve for x
   x = 200,870,960.14/14,839.20
6. Step 6: Final answer
   x = 13,536.51