Finding the Fourth Proportional to 21,687.72, 32,542.52 and 16,978.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,687.72 : 32,542.52 = 16,978.38 : x
2. Step 2: Convert to fraction form
   21,687.72/32,542.52 = 16,978.38/x
3. Step 3: Cross multiply
   21,687.72x = 32,542.52 × 16,978.38
4. Step 4: Simplify right side
   21,687.72x = 552,519,185.83
5. Step 5: Solve for x
   x = 552,519,185.83/21,687.72
6. Step 6: Final answer
   x = 25,476.13