Finding the Fourth Proportional to 13,922.72, 19,238.79 and 10,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,922.72 : 19,238.79 = 10,139.30 : x
2. Step 2: Convert to fraction form
   13,922.72/19,238.79 = 10,139.30/x
3. Step 3: Cross multiply
   13,922.72x = 19,238.79 × 10,139.30
4. Step 4: Simplify right side
   13,922.72x = 195,067,863.45
5. Step 5: Solve for x
   x = 195,067,863.45/13,922.72
6. Step 6: Final answer
   x = 14,010.76