Finding the Fourth Proportional to 10,142.01, 14,067.57 and 9,872.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,142.01 : 14,067.57 = 9,872.28 : x
2. Step 2: Convert to fraction form
   10,142.01/14,067.57 = 9,872.28/x
3. Step 3: Cross multiply
   10,142.01x = 14,067.57 × 9,872.28
4. Step 4: Simplify right side
   10,142.01x = 138,878,989.96
5. Step 5: Solve for x
   x = 138,878,989.96/10,142.01
6. Step 6: Final answer
   x = 13,693.44