Finding the Fourth Proportional to 15,728.72, 21,703.83 and 9,012.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,728.72 : 21,703.83 = 9,012.50 : x
2. Step 2: Convert to fraction form
   15,728.72/21,703.83 = 9,012.50/x
3. Step 3: Cross multiply
   15,728.72x = 21,703.83 × 9,012.50
4. Step 4: Simplify right side
   15,728.72x = 195,605,767.88
5. Step 5: Solve for x
   x = 195,605,767.88/15,728.72
6. Step 6: Final answer
   x = 12,436.22