Finding the Fourth Proportional to 15,730.56, 21,707.79 and 9,020.12

Step by Step Solution

1. Step 1: Write the proportion equation
   15,730.56 : 21,707.79 = 9,020.12 : x
2. Step 2: Convert to fraction form
   15,730.56/21,707.79 = 9,020.12/x
3. Step 3: Cross multiply
   15,730.56x = 21,707.79 × 9,020.12
4. Step 4: Simplify right side
   15,730.56x = 195,806,870.73
5. Step 5: Solve for x
   x = 195,806,870.73/15,730.56
6. Step 6: Final answer
   x = 12,447.55