Finding the Fourth Proportional to 15,643.34, 21,581.79 and 8,929.34

Step by Step Solution

1. Step 1: Write the proportion equation
   15,643.34 : 21,581.79 = 8,929.34 : x
2. Step 2: Convert to fraction form
   15,643.34/21,581.79 = 8,929.34/x
3. Step 3: Cross multiply
   15,643.34x = 21,581.79 × 8,929.34
4. Step 4: Simplify right side
   15,643.34x = 192,711,140.72
5. Step 5: Solve for x
   x = 192,711,140.72/15,643.34
6. Step 6: Final answer
   x = 12,319.05