Finding the Fourth Proportional to 21,609.50, 32,418.17 and 10,516.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,609.50 : 32,418.17 = 10,516.20 : x
2. Step 2: Convert to fraction form
   21,609.50/32,418.17 = 10,516.20/x
3. Step 3: Cross multiply
   21,609.50x = 32,418.17 × 10,516.20
4. Step 4: Simplify right side
   21,609.50x = 340,915,883.79
5. Step 5: Solve for x
   x = 340,915,883.79/21,609.50
6. Step 6: Final answer
   x = 15,776.20