Finding the Fourth Proportional to 21,609.16, 32,410.96 and 5,815.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,609.16 : 32,410.96 = 5,815.50 : x
2. Step 2: Convert to fraction form
   21,609.16/32,410.96 = 5,815.50/x
3. Step 3: Cross multiply
   21,609.16x = 32,410.96 × 5,815.50
4. Step 4: Simplify right side
   21,609.16x = 188,485,937.88
5. Step 5: Solve for x
   x = 188,485,937.88/21,609.16
6. Step 6: Final answer
   x = 8,722.50