Finding the Fourth Proportional to 21,144.38, 31,677.42 and 10,602.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,144.38 : 31,677.42 = 10,602.10 : x
2. Step 2: Convert to fraction form
   21,144.38/31,677.42 = 10,602.10/x
3. Step 3: Cross multiply
   21,144.38x = 31,677.42 × 10,602.10
4. Step 4: Simplify right side
   21,144.38x = 335,847,174.58
5. Step 5: Solve for x
   x = 335,847,174.58/21,144.38
6. Step 6: Final answer
   x = 15,883.52