Finding the Fourth Proportional to 21,792.80, 32,693.52 and 8,642.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,792.80 : 32,693.52 = 8,642.72 : x
2. Step 2: Convert to fraction form
   21,792.80/32,693.52 = 8,642.72/x
3. Step 3: Cross multiply
   21,792.80x = 32,693.52 × 8,642.72
4. Step 4: Simplify right side
   21,792.80x = 282,560,939.17
5. Step 5: Solve for x
   x = 282,560,939.17/21,792.80
6. Step 6: Final answer
   x = 12,965.79