Finding the Fourth Proportional to 15,665.83, 21,618.74 and 8,495.67

Step by Step Solution

1. Step 1: Write the proportion equation
   15,665.83 : 21,618.74 = 8,495.67 : x
2. Step 2: Convert to fraction form
   15,665.83/21,618.74 = 8,495.67/x
3. Step 3: Cross multiply
   15,665.83x = 21,618.74 × 8,495.67
4. Step 4: Simplify right side
   15,665.83x = 183,665,680.86
5. Step 5: Solve for x
   x = 183,665,680.86/15,665.83
6. Step 6: Final answer
   x = 11,723.97