Finding the Fourth Proportional to 15,436.29, 21,300.81 and 8,722.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,436.29 : 21,300.81 = 8,722.50 : x
2. Step 2: Convert to fraction form
   15,436.29/21,300.81 = 8,722.50/x
3. Step 3: Cross multiply
   15,436.29x = 21,300.81 × 8,722.50
4. Step 4: Simplify right side
   15,436.29x = 185,796,315.23
5. Step 5: Solve for x
   x = 185,796,315.23/15,436.29
6. Step 6: Final answer
   x = 12,036.33