Finding the Fourth Proportional to 15,762.22, 21,751 and 8,688.09

Step by Step Solution

1. Step 1: Write the proportion equation
   15,762.22 : 21,751 = 8,688.09 : x
2. Step 2: Convert to fraction form
   15,762.22/21,751 = 8,688.09/x
3. Step 3: Cross multiply
   15,762.22x = 21,751 × 8,688.09
4. Step 4: Simplify right side
   15,762.22x = 188,974,645.59
5. Step 5: Solve for x
   x = 188,974,645.59/15,762.22
6. Step 6: Final answer
   x = 11,989.09