Finding the Fourth Proportional to 14,139.88, 21,067.73 and 13,345

Step by Step Solution

1. Step 1: Write the proportion equation
   14,139.88 : 21,067.73 = 13,345 : x
2. Step 2: Convert to fraction form
   14,139.88/21,067.73 = 13,345/x
3. Step 3: Cross multiply
   14,139.88x = 21,067.73 × 13,345
4. Step 4: Simplify right side
   14,139.88x = 281,148,856.85
5. Step 5: Solve for x
   x = 281,148,856.85/14,139.88
6. Step 6: Final answer
   x = 19,883.40