Finding the Fourth Proportional to 21,185.21, 31,901.72 and 15,677.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,185.21 : 31,901.72 = 15,677.42 : x
2. Step 2: Convert to fraction form
   21,185.21/31,901.72 = 15,677.42/x
3. Step 3: Cross multiply
   21,185.21x = 31,901.72 × 15,677.42
4. Step 4: Simplify right side
   21,185.21x = 500,136,425.27
5. Step 5: Solve for x
   x = 500,136,425.27/21,185.21
6. Step 6: Final answer
   x = 23,607.82