Finding the Fourth Proportional to 21,646.16, 32,487.68 and 8,507.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,646.16 : 32,487.68 = 8,507.72 : x
2. Step 2: Convert to fraction form
   21,646.16/32,487.68 = 8,507.72/x
3. Step 3: Cross multiply
   21,646.16x = 32,487.68 × 8,507.72
4. Step 4: Simplify right side
   21,646.16x = 276,396,084.89
5. Step 5: Solve for x
   x = 276,396,084.89/21,646.16
6. Step 6: Final answer
   x = 12,768.83